What kind of data is the colors of the cars around the gym in the scenario

This

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2 class does not have a

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4 method. Hence, it cannot be run directly. This

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2 class is a “building block” and is meant to be used in another program.

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Exercises on Composition
More Exercises on Classes
Exercises on Inheritance
Exercises on Composition vs Inheritance
Exercises on Polymorphism, Abstract Classes and Interfaces
More Exercises on OOP
Exercises on Data Structures

Let us write a test program called

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6 (in another source file called

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7) which uses the

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2 class, as follows:

Now, run the

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6 and study the results.

More Basic OOP Concepts

Constructor: Modify the class

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2 to include a third constructor for constructing a

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2 instance with two arguments - a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2 for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 and a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4 for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3. Modify the test program

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6 to construct an instance of

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2 using this constructor.

Getter: Add a getter for variable

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 for retrieving the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 of this instance. Modify the test program to test this method.

public vs. private: In

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6, can you access the instance variable

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 directly (e.g.,

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

2); or assign a new value to

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 (e.g.,

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

4)? Try it out and explain the error messages.

Setter: Is there a need to change the values of

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 of a

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2 instance after it is constructed? If so, add two

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods called setters for changing the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 of a

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2 instance as follows: Modify the

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6 to test these methods, e.g.,

Keyword "this": Instead of using variable names such as

public Ball(float x, float y, int radius, int speed, int directionInDegree)

3 (for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1) and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

5 (for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3) in the methods' arguments, it is better to use variable names

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 (for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1) and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 (for

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3) and use the special keyword "

public Author (String name, String email, char gender) {......}

1" to resolve the conflict between instance variables and methods' arguments. For example, Modify ALL the constructors and setters in the

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2 class to use the keyword "

public Author (String name, String email, char gender) {......}

1".

Method toString(): Every well-designed Java class should contain a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 method called

public Author (String name, String email, char gender) {......}

5 that returns a description of the instance (in the return type of

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4). The

public Author (String name, String email, char gender) {......}

5 method can be called explicitly (via

public Author (String name, String email, char gender) {......}

8) just like any other method; or implicitly through

public Author (String name, String email, char gender) {......}

9. If an instance is passed to the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

00 method, the

public Author (String name, String email, char gender) {......}

5 method of that instance will be invoked implicitly. For example, include the following

public Author (String name, String email, char gender) {......}

5 methods to the

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2 class: Try calling

public Author (String name, String email, char gender) {......}

5 method explicitly, just like any other method:

public Author (String name, String email, char gender) {......}

5 is called implicitly when an instance is passed to

public Author (String name, String email, char gender) {......}

9 method, for example,

The final class diagram for the

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2 class is as follows:

What kind of data is the colors of the cars around the gym in the scenario

Ex: Yet Another Circle Class

A class called

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2, which models a circle with a radius, is designed as shown in the following class diagram. Write the

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2 class.

Below is a Test Driver to test your

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2 class.

The expected output is:

Circle[radius=1.1]
Circle[radius=1.0]
Circle[radius=2.2]
radius is: 2.2
area is: 15.21
circumference is: 13.82

Ex: The Rectangle Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11, which models a rectangle with a length and a width (in

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

12), is designed as shown in the following class diagram. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11 class.

Below is a test driver to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11 class:

The expected output is:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

Ex: The Employee Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

15, which models an employee with an ID, name and salary, is designed as shown in the following class diagram. The method

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

16 increases the salary by the given percentage. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

15 class.

Below is a test driver to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

15 class:

The expected out is:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Ex: The InvoiceItem Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

19, which models an item of an invoice, with ID, description, quantity and unit price, is designed as shown in the following class diagram. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

19 class.

Below is a test driver to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

19 class:

The expected output is:

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

Ex: The Account Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22, which models a bank account of a customer, is designed as shown in the following class diagram. The methods

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

23 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

24 add or subtract the given

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

25 to the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

26. The method

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

27 transfers the given

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

25 from this

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22 to the given

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

30. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22 class.

Below is a test driver to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22 class:

The expected output is:

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Ex: The Date Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

33, which models a calendar date, is designed as shown in the following class diagram. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

33 class.

Below is a test driver to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

33 class:

The expected output is:

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

Ex: The Time Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

36, which models a time instance, is designed as shown in the following class diagram. The methods

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

37 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

38 shall advance or rewind this instance by one second, and return this instance, so as to support chaining operation such as

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

39. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

36 class.

Below is a test driver for testing the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

36 class:

The expected output is:

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

Ex: The Ball Class

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42, which models a bouncing ball, is designed as shown in the following class diagram. It contains its radius, x and y position. Each move-step advances the x and y by delta-x and delta-y, respectively. delta-x and delta-y could be positive or negative. The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

43 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

44 methods could be used to bounce the ball off the walls. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class. Study the test driver on how the ball bounces.

Below is a test driver:

The expected output is:

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

Try: Modify the constructor to take in speed and direction (in polar coordinates) instead of delta-x and delta-y (in cartesian coordinates), which is more convenient for the users.

public Ball(float x, float y, int radius, int speed, int directionInDegree)

Exercises on Composition

This first exercise shall lead you through all the concepts involved in OOP Composition.

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 (as shown in the class diagram) is designed to model a book's author. It contains:

Three

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4),

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

50 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4), and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

52 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

53 of either

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

54 or

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

55);

One constructor to initialize the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

50 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

52 with the given values;

public Author (String name, String email, char gender) {......}

(There is no default constructor for Author, as there are no defaults for name, email and gender.)

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 getters/setters:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

60,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

61,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

62, and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

63;
(There are no setters for

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

52, as these attributes cannot be changed.)

public Author (String name, String email, char gender) {......}

5 method that returns "

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

67", e.g., "

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

68".

Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 class. Also write a test driver called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

70 to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods, e.g.,

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 is designed (as shown in the class diagram) to model a book written by one author. It contains:

Four

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4),

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

76 (of the class

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 you have just created, assume that a book has one and only one author),

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

78 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2), and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

80 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81);

Two constructors:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

public methods

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

60,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

83,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

84,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

85,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

86,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

87.

public Author (String name, String email, char gender) {......}

5 that returns "

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

89". You should reuse

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46’s

public Author (String name, String email, char gender) {......}

Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 class (which uses the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 class written earlier). Also write a test driver called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

94 to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods in the class

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72. Take Note that you have to construct an instance of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 before you can construct an instance of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72. E.g.,

Take note that both

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 classes have a variable called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48. However, it can be differentiated via the referencing instance. For a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 instance says

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

03,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

04 refers to the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 of the book; whereas for an

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46's instance say

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

07,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

08 refers to the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 of the author. There is no need (and not recommended) to call the variables

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

10 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

11.

TRY:

Printing the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

50 of the author from a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 instance. (Hint:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

15,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

16).

Introduce new methods called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

17,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

18,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

19 in the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 class to return the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

48,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

50 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

52 of the author of the book. For example,

(Advanced) The Author and Book Classes Again - An Array of Objects as an Instance Variable

In the earlier exercise, a book is written by one and only one author. In reality, a book can be written by one or more author. Modify the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 class to support one or more authors by changing the instance variable

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

25 to an

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 array.

Notes:

The constructors take an array of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 (i.e.,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

28), instead of an

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 instance. In this design, once a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 instance is constructor, you cannot add or remove author.

The

public Author (String name, String email, char gender) {......}

5 method shall return "

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

32".

You are required to:

Write the code for the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 class. You shall re-use the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 class written earlier.

Write a test driver (called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

94) to test the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 class.

Hints:

Ex: The Author and Book Classes - Your Turn

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46, which models an author of a book, is designed as shown in the class diagram. A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72, which models a book written by ONE author and composes an instance of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 as its instance variable, is also shown. Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

46 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

72 classes.

Below is a test driver:

The expected output is:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

Ex: The Customer and Invoice classes

A class called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42, which models a customer in a transaction, is designed as shown in the class diagram. A class called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

43, which models an invoice for a particular customer and composes an instance of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42 as its instance variable, is also shown. Write the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

43 classes.

Below is a test driver:

The expected output is:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

Ex: The Customer and Account classes

The

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42 class models a customer is design as shown in the class diagram. Write the codes for the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42 class and a test driver to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods.

The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22 class models a bank account, design as shown in the class diagram, composes a

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42 instance (written earlier) as its member. Write the codes for the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

22 class and a test driver to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods.

Ex: The MyPoint Class

A class called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54, which models a 2D point with x and y coordinates, is designed as shown in the class diagram.

It contains:

Two instance variables

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81) and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81).

A default (or "no-argument" or "no-arg") constructor that construct a point at the default location of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

59.

A overloaded constructor that constructs a point with the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 coordinates.

Getter and setter for the instance variables

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57.

A method

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

64 to set both

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57.

A method

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

67 which returns the x and y in a 2-element

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81 array.

public Author (String name, String email, char gender) {......}

5 method that returns a string description of the instance in the format "

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

70".

A method called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

71 that returns the distance from this point to another point at the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

72 coordinates, e.g.,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

An overloaded

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

73 that returns the distance from this point to the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instance (called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

75), e.g.,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

Another overloaded

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

76 method that returns the distance from

public Author (String name, String email, char gender) {......}

1 point to the origin

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

78, e.g.,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

You are required to:

Write the code for the class

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54. Also write a test program (called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

80) to test all the methods defined in the class.
Hints:

Write a program that allocates

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

81 points in an array of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54, and initializes to

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

83,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

84, ...

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

85.
Hints: You need to allocate the array, as well as each of the 10

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instances. In other words, you need to issue 11

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

87, 1 for the array and 10 for the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instances.

Notes: Point is such a common entity that JDK certainly provided for in all flavors.

Ex: The MyLine and MyPoint Classes

A class called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

89, which models a line with a begin point at (x1, y1) and an end point at (x2, y2), is designed as shown in the class diagram. The

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

89 class uses two

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instances (written in the earlier exercise) as its begin and end points. Write the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

89 class. Also write a test driver to test all the public methods in the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

89 class.

Ex: The MyCircle and MyPoint Classes

A class called

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

94, which models a circle with a center and a radius, is designed as shown in the class diagram. The

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

94 class uses a

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instance (written in the earlier exercise) as its center.

The class contains:

Two

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

98 (an instance of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54) and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81).

A constructor that constructs a circle with the given center's (

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57) and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

An overloaded constructor that constructs a

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

94 given a

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instance as

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

98, and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

A default constructor that construct a circle with center at

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

78 and radius of

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10.

Various getters and setters.

public Author (String name, String email, char gender) {......}

5 method that returns a string description of this instance in the format "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

12". You shall reuse the

public Author (String name, String email, char gender) {......}

5 of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54.

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

16 methods that return the area and circumference of

public Author (String name, String email, char gender) {......}

1 circle in

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

19 method that returns the distance of the centers from

public Author (String name, String email, char gender) {......}

1 instance and the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

94 instance. You should use

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54’s

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

76 method to compute this distance.

Write the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

94 class. Also write a test driver (called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

25) to test all the public methods defined in the class.

Hints:

Ex: The MyTriangle and MyPoint Classes

A class called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

26, which models a triangle with 3 vertices, is designed as shown in the class diagram. The

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

26 class uses three

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instances (created in the earlier exercise) as the three vertices.

It contains:

Three

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

30,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

31,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

32 (instances of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54), for the three vertices.

A constructor that constructs a

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

26 with three set of coordinates,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

35,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

36,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

37.

An overloaded constructor that constructs a

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

26 given three instances of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54.

public Author (String name, String email, char gender) {......}

5 method that returns a string description of the instance in the format "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

41".

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42 method that returns the length of the perimeter in double. You should use the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

76 method of

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 to compute the perimeter.

A method

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

45, which prints "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

46" if all the three sides are equal, "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

47" if any two of the three sides are equal, or "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

48" if the three sides are different.

Write the

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

26 class. Also write a test driver (called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

50) to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods defined in the class.

Ex: The MyRectangle and MyPoint Classes

Design a

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

52 class which is composed of two

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

54 instances as its top-left and bottom-right corners. Draw the class diagrams, write the codes, and write the test drivers.

More Exercises on Classes

Ex: The MyComplex class

A class called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54, which models a complex number with real and imaginary parts, is designed as shown in the class diagram.

It contains:

Two instance variable named

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

55 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2) and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

57 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2) which stores the real and imaginary parts of the complex number, respectively.

A constructor that creates a

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance with the given real and imaginary values.

A default constructor that create a MyComplex at

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

60.

Getters and setters for instance variables

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

55 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

57.

A method

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

63 to set the value of the complex number.

public Author (String name, String email, char gender) {......}

5 that returns "

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

65" where

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 are the real and imaginary parts, respectively.

Methods

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

68 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

69 that returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70 if this complex number is real or imaginary, respectively.
Hints:

A method

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

71 that returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70 if

public Author (String name, String email, char gender) {......}

1 complex number is equal to the given complex number (real, imag).
Hints:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

An overloaded

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

74 that returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70 if this complex number is equal to the given

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

75.
Hints:

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

A method

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

78 that returns the magnitude of this complex number.

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

Methods

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

79 that adds and subtract the given

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance (called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

81) into

public Author (String name, String email, char gender) {......}

1 instance and returns

public Author (String name, String email, char gender) {......}

1 instance.

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

9Hints:

Methods

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

84 that adds

public Author (String name, String email, char gender) {......}

1 instance with the given

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

81, and returns a new

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance containing the result.
Hint:

You are required to:

Write the

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 class.

Write a test driver to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods defined in the class.

Write an application called

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

91 that uses the

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 class. The application shall prompt the user for two complex numbers, print their values, check for real, imaginary and equality, and carry out all the arithmetic operations.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Try: A (more) complete design of

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 class is shown below:

Methods

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

94 that returns the argument of this complex number in radians (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2).

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

1Note: The

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

96 library has two arc-tangent methods,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

97 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

98. We commonly use the

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

99 instead of

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

00 to avoid division by zero. Read the documentation of

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

96 class in package

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

02.

The method

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

03 is renamed

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

04. Also added

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

05 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

06.

Methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

07 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

08 that multiplies and divides

public Author (String name, String email, char gender) {......}

1 instance with the given

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54 instance

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

81, and keeps the result in

public Author (String name, String email, char gender) {......}

1 instance, and returns this instance.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

A method

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

13 that operates on

public Author (String name, String email, char gender) {......}

1 instance and returns

public Author (String name, String email, char gender) {......}

1 instance containing the complex conjugate.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Take note that there are a few flaws in the design of this class, which was introduced solely for teaching purpose:

Comparing

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2s in

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

17 using "

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

18" may produce unexpected outcome. For example,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

19 returns

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

20. It is common to define a small threshold called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

21 (set to about

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

22) for comparing floating point numbers.

The method

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

23,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

06 produce new instances, whereas

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

04,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

05,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

27,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

28 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

13 modify

public Author (String name, String email, char gender) {......}

1 instance. There is inconsistency in the design (introduced for teaching purpose).

Also take note that methods such as

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

04 returns an instance of

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

54. Hence, you can place the result inside a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

33 (which implicitly invoke the

public Author (String name, String email, char gender) {......}

5). You can also chain the operations, e.g.,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

35 (same as

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

36, or

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

37.

Ex: The MyPolynomial Class

A class called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

38, which models polynomials of degree-

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

39 (see equation), is designed as shown in the class diagram.

It contains:

An instance variable named

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

40, which stores the coefficients of the n-degree polynomial in a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2 array of size

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

42, where c0 is kept at index 0.

A constructor
```
Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]
```
43 that takes a variable number of doubles to initialize the coeffs array, where the first argument corresponds to c0.
The three dots is known as varargs (variable number of arguments), which is a new feature introduced in JDK 1.5. It accepts an array or a sequence of comma-separated arguments. The compiler automatically packs the comma-separated arguments in an array. The three dots can only be used for the last argument of the method.
Hints:

A method

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

44 that returns the degree of this polynomial.

A method

public Author (String name, String email, char gender) {......}

5 that returns "cnx^n+cn-1x^(n-1)+...+c1x+c0".

A method

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

46 that evaluate the polynomial for the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55, by substituting the given

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 into the polynomial expression.

Methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

04 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

27 that adds and multiplies this polynomial with the given

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

38 instance

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

75, and returns

public Author (String name, String email, char gender) {......}

1 instance that contains the result.

Write the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

38 class. Also write a test driver (called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

55) to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods defined in the class.

Question: Do you need to keep the degree of the polynomial as an instance variable in the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

38 class in Java? How about C/C++? Why?

Ex: Using JDK's BigInteger Class

Recall that primitive integer type

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

58,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

59,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

61 represent 8-, 16-, 32-, and 64-bit signed integers, respectively. You cannot use them for integers bigger than 64 bits. Java API provides a class called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

62 in a package called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

63. Study the API of the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

62 class (Java API ⇒ From "Packages", choose "java.math" " From "classes", choose "BigInteger" " Study the constructors (choose "CONSTR") on how to construct a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

62 instance, and the public methods available (choose "METHOD"). Look for methods for adding and multiplying two

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

66.

Write a program called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

67 that:

adds "11111111111111111111111111111111111111111111111111111111111111" to "22222222222222222222222222222222222222222222222222" and prints the result.
multiplies the above two number and prints the result.

Hints:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Ex: The MyTime Class

A class called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

68, which models a time instance, is designed as shown in the class diagram.

It contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

70: between 0 to 23.

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

71: between 0 to 59.

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

72: between 0 to 59.

You are required to perform input validation.

It contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods:

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

74: It shall check if the given

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

70,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

71 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

77 are valid before setting the instance variables.
(Advanced: Otherwise, it shall throw an

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

78 with the message "Invalid hour, minute, or second!".)

Setters

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

79,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

80,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

81: It shall check if the parameters are valid, similar to the above.

Getters

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

82,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

83,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

84.

public Author (String name, String email, char gender) {......}

5: returns "

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

86".

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

37: Update this instance to the next second and return this instance. Take note that the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

37 of

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

89 is

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

90.

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

91,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

92,

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

38,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

94,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

95: similar to the above.

Write the code for the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

68 class. Also write a test driver (called

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

97) to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods defined in the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

68 class.

Ex: The MyDate Class

A class called

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00, which models a date instance, is defined as shown in the class diagram.

The

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81): Between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 to

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

06.

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81): Between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 (Jan) to

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

10 (Dec).

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11 (

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81): Between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 to

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

14, where the last day depends on the month and whether it is a leap year for Feb (

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

15).

It also contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

17 variables (drawn with underlined in the class diagram):

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

18 (

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

19),

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

20 (

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

19), and DAY_IN_

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

18 (

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

23):

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

24 variables, initialized as shown, which are used in the methods.

The

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class has the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

24 methods (drawn with underlined in the class diagram):

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

28: returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70 if the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03 is a leap year. A year is a leap year if it is divisible by 4 but not by 100, or it is divisible by 400.

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

31: returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70 if the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07, and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11 constitute a valid date. Assume that

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03 is between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

06,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 is between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 (Jan) to

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

10 (Dec) and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11 shall be between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

14 depending on the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 and whether it is a leap year on Feb.

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

46: returns the day of the week, where

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

47 for Sun,

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 for Mon, ...,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

49 for Sat, for the given date. Assume that the date is valid. Read the earlier exercise on how to determine the day of the week (or Wiki "Determination of the day of the week").

The

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class has one constructor, which takes 3 parameters:

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11. It shall invoke

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

54 method (to be described later) to set the instance variables.

The

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class has the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods:

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

57: It shall invoke the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

24 method

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

59 to verify that the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11 constitute a valid date.
(Advanced: Otherwise, it shall throw an

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

78 with the message "Invalid year, month, or day!".)

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

64: It shall verify that the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03 is between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

06.
(Advanced: Otherwise, it shall throw an

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

78 with the message "Invalid year!".)

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

69: It shall verify that the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 is between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

10.
(Advanced: Otherwise, it shall throw an

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

78 with the message "Invalid month!".)

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

74: It shall verify that the given

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11 is between

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

10 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

77, where

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

77 depends on the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 and whether it is a leap year for Feb.
(Advanced: Otherwise, it shall throw an

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

78 with the message "Invalid month!".)

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

81,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

82,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

83: return the value for the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

03,

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

07 and

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

11, respectively.

public Author (String name, String email, char gender) {......}

5: returns a date string in the format "

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

88", e.g., "Tuesday 14 Feb 2012".

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

89: update

public Author (String name, String email, char gender) {......}

1 instance to the next day and return

public Author (String name, String email, char gender) {......}

1 instance. Take note that

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

89 for

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

93 shall be

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

94.

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

95: update

public Author (String name, String email, char gender) {......}

1 instance to the next month and return

public Author (String name, String email, char gender) {......}

1 instance. Take note that

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

95 for

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

99 shall be

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

00.

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

01: update

public Author (String name, String email, char gender) {......}

1 instance to the next year and return

public Author (String name, String email, char gender) {......}

1 instance. Take note that

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

01 for

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

05 shall be

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

06.
(Advanced: throw an

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

07 with the message "Year out of range!" if year > 9999.)

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

08,

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

09,

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

10: similar to the above.

Write the code for the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class.

Use the following test statements to test the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

00 class:

Write a test program that tests the

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

89 in a loop, by printing the dates from

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

14 to

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

15.

Ex: Bouncing Balls - Ball and Container Classes

A class called

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 is designed as shown in the class diagram.

The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 instance variables:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1, which represent the ball's center

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

72 co-ordinates and the radius, respectively.

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

23 (

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

24) and

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

25 (

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

26), which represent the displacement (movement) per step, in the

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 direction respectively.

The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class contains the following

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods:

A constructor which accepts

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57,

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

34, and

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

35 as arguments. For user friendliness, user specifies

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

34 (in pixels per step) and

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

35 (in degrees in the range of

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

38). For the internal operations, the

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

34 and

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

35 are to be converted to

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

41 in the internal representation. Note that the y-axis of the Java graphics coordinate system is inverted, i.e., the origin

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

59 is located at the top-left corner.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Getter and setter for all the instance variables.

A method

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

43 which move the ball by one step.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

43 which reflects the ball horizontally (i.e., hitting a vertical wall)

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

44 (the ball hits a horizontal wall).

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

public Author (String name, String email, char gender) {......}

5 which prints the message "

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47".

Write the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class. Also write a test program to test all the methods defined in the class.

A class called

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49, which represents the enclosing box for the ball, is designed as shown in the class diagram. It contains:

Instance variables

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50 and

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51 which denote the top-left and bottom-right corners of the rectangular box.

A constructor which accepts

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

72 of the top-left corner,

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53 and

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54 as argument, and converts them into the internal representation (i.e.,

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55).

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56 and

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54 is used in the argument for safer operation (there is no need to check the validity of

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58 etc.).

public Author (String name, String email, char gender) {......}

5 method that returns "

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60".

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61 method called

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62, which check if the given

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 is outside the bounds of the container box. If so, it invokes the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42's

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

43 and/or

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

44 to change the movement direction of the ball, and returns

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70.

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

Use the following statements to test your program:

Ex: The Ball and Player Classes

The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class, which models the ball in a soccer game, is designed as shown in the class diagram. Write the codes for the

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

42 class and a test driver to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods.

The

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71 class, which models the players in a soccer game, is designed as shown in the class diagram. The Player interacts with the Ball (written earlier). Write the codes for the

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71 class and a test driver to test all the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 methods. Make your assumption for the

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74.

Can you write a very simple soccer game with 2 teams of players and a ball, inside a soccer field?

Exercises on Inheritance

An Introduction to OOP Inheritance by Example - The Circle and Cylinder Classes

This exercise shall guide you through the important concepts in inheritance.

In this exercise, a subclass called

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75 is derived from the superclass

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2 as shown in the class diagram (where an an arrow pointing up from the subclass to its superclass). Study how the subclass

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75 invokes the superclass' constructors (via

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78 and

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79) and inherits the variables and methods from the superclass

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You can reuse the

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2 class that you have created in the previous exercise. Make sure that you keep "

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82" in the same directory.

Write a test program (says

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83) to test the

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75 class created, as follow:

Method Overriding and "Super": The subclass

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75 inherits

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 method from its superclass Circle. Try overriding the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 method in the subclass

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75 to compute the surface area (=2π×radius×height + 2×base-area) of the cylinder instead of base area. That is, if

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 is called by a

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2 instance, it returns the area. If

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 is called by a

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75 instance, it returns the surface area of the cylinder.

If you override the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 in the subclass

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75, the

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95 no longer works. This is because the

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95 uses the overridden

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 method found in the same class. (Java runtime will search the superclass only if it cannot locate the method in this class). Fix the

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95.

Hints: After overridding the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 in subclass

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75, you can choose to invoke the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 of the superclass

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2 by calling

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

03.

TRY:

Provide a

public Author (String name, String email, char gender) {......}

5 method to the

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75 class, which overrides the

public Author (String name, String email, char gender) {......}

5 inherited from the superclass

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2, e.g.,

Try out the

public Author (String name, String email, char gender) {......}

5 method in

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83.

Note:

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10 is known as annotation (introduced in JDK 1.5), which asks compiler to check whether there is such a method in the superclass to be overridden. This helps greatly if you misspell the name of the

public Author (String name, String email, char gender) {......}

5. If

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10 is not used and

public Author (String name, String email, char gender) {......}

5 is misspelled as

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

14, it will be treated as a new method in the subclass, instead of overriding the superclass. If

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10 is used, the compiler will signal an error.

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10 annotation is optional, but certainly nice to have.

Ex: Superclass Person and its subclasses

Write the classes as shown in the following class diagram. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

Ex: Point2D and Point3D

Write the classes as shown in the following class diagram. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

Hints:

You cannot assign floating-point literal say

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

19 (which is a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2) to a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

12 variable, you need to add a suffix f, e.g.

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

22,

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

23.

The instance variables

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 are

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 in

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

27 and cannot be accessed directly in the subclass

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

28. You need to access via the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 getters and setters. For example,

The method

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

67 shall return a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

12 array:

Ex: Point and MovablePoint

Write the classes as shown in the following class diagram. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

Hints

You cannot assign floating-point literal say

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

19 (which is a

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2) to a

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

12 variable, you need to add a suffix f, e.g.

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

22,

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

23.

The instance variables

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55 and

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57 are

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

0 in

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41 and cannot be accessed directly in the subclass

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42. You need to access via the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

7 getters and setters. For example, you cannot write

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

44, you need to write

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

45.

Ex: Superclass Shape and its subclasses Circle, Rectangle and Square

Write a superclass called

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46 (as shown in the class diagram), which contains:

Two instance variables

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4) and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

49 (

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

61).

Two constructors: a no-arg (no-argument) constructor that initializes the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 to "green" and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

49 to

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

70, and a constructor that initializes the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

3 and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

49 to the given values.

Getter and setter for all the instance variables. By convention, the getter for a

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

61 variable

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

57 is called

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

58 (instead of

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

59 for all the other types).

public Author (String name, String email, char gender) {......}

5 method that returns "

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

61".

Write a test program to test all the methods defined in

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46.

Write two subclasses of

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46 called

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11, as shown in the class diagram.

The

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2 class contains:

An instance variable

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2).

Three constructors as shown. The no-arg constructor initializes the radius to

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Getter and setter for the instance variable

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42.

Override the

public Author (String name, String email, char gender) {......}

5 method inherited, to return "

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

74", where

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

75 is the output of the

public Author (String name, String email, char gender) {......}

5 method from the superclass.

The

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11 class contains:

Two instance variables

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

53 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2) and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

80 (

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

2).

Three constructors as shown. The no-arg constructor initializes the

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

53 and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

80 to

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Getter and setter for all the instance variables.

Methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42.

Override the

public Author (String name, String email, char gender) {......}

5 method inherited, to return "

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

88", where

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

75 is the output of the

public Author (String name, String email, char gender) {......}

5 method from the superclass.

Write a class called

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

91, as a subclass of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11. Convince yourself that

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

91 can be modeled as a subclass of

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11.

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

91 has no instance variable, but inherits the instance variables width and length from its superclass Rectangle.

Provide the appropriate constructors (as shown in the class diagram). Hint:

Override the

public Author (String name, String email, char gender) {......}

5 method to return "

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

97", where

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

75 is the output of the

public Author (String name, String email, char gender) {......}

5 method from the superclass.

Do you need to override the

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42? Try them out.

Override the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

02 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

03 to change both the

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

53 and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

80, so as to maintain the square geometry.

Ex: Superclass Animal and its subclasses

Write the codes for all the classes as shown in the class diagram.

Exercises on Composition vs Inheritance

They are two ways to reuse a class in your applications: composition and inheritance.

Ex: The Point and Line Classes

Let us begin with composition with the statement "a line composes of two points".

Complete the definition of the following two classes:

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07. The class

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 composes 2 instances of class

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41, representing the beginning and ending points of the line. Also write test classes for

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 (says

public Ball(float x, float y, int radius, int speed, int directionInDegree)

12 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

13).

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

The class diagram for composition is as follows (where a diamond-hollow-head arrow pointing to its constituents):

Instead of composition, we can design a

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 class using

public Ball(float x, float y, int radius, int speed, int directionInDegree)

15. Instead of "a line composes of two points", we can say that "a line is a point extended by another point", as shown in the following class diagram:

Let's re-design the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 class (called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

17) as a subclass of class

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41.

public Ball(float x, float y, int radius, int speed, int directionInDegree)

17 inherits the starting point from its superclass

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

41, and adds an ending point. Complete the class definition. Write a testing class called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

21 to test

public Ball(float x, float y, int radius, int speed, int directionInDegree)

17.

Summary: There are two approaches that you can design a line,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

23 or

public Ball(float x, float y, int radius, int speed, int directionInDegree)

15. "A line composes two points" or "A line is a point extended with another point"”. Compare the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

17 designs:

public Ball(float x, float y, int radius, int speed, int directionInDegree)

07 uses composition and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

17 uses inheritance. Which design is better?

Ex: The Circle and Cylinder Classes Using Composition

Try rewriting the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

29 of the previous exercise using composition (as shown in the class diagram) instead of inheritance. That is, "a cylinder is composed of a base circle and a height".

Which design (inheritance or composition) is better?

Exercises on Polymorphism, Abstract Classes and Interfaces

Ex: Abstract Superclass Shape and Its Concrete Subclasses

Rewrite the superclass

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46 and its subclasses

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11 and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

91, as shown in the class diagram.

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46 is an

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 class containing 2

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods:

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42, where its concrete subclasses must provide its implementation. All instance variables shall have

public Ball(float x, float y, int radius, int speed, int directionInDegree)

39 access, i.e., accessible by its subclasses and classes in the same package. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

In this exercise,

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

46 shall be defined as an

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 class, which contains:

Two

public Ball(float x, float y, int radius, int speed, int directionInDegree)

39 instance variables

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

4) and

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

49(

01:02:03
04:05:06
Hour: 4
Minute: 5
Second: 6
23:59:58
23:59:59
00:00:01
00:00:00
23:59:58

61). The

public Ball(float x, float y, int radius, int speed, int directionInDegree)

39 variables can be accessed by its subclasses and classes in the same package. They are denoted with a

public Ball(float x, float y, int radius, int speed, int directionInDegree)

49 sign in the class diagram.

Getter and setter for all the instance variables, and

public Author (String name, String email, char gender) {......}

Two

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42 (shown in italics in the class diagram).

The subclasses

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2 and

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

11 shall override the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42 and provide the proper implementation. They also override the

public Author (String name, String email, char gender) {......}

Write a test class to test these statements involving polymorphism and explain the outputs. Some statements may trigger compilation errors. Explain the errors, if any.

What is the usage of the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 method and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 class?

Ex: GeometricObject Interface and its Implementation Classes Circle and Rectangle

Write an interface called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

62, which contains 2

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods:

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9 and

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

42, as shown in the class diagram. Also write an implementation class called

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

Ex: Movable Interface and its Implementation MovablePoint Class

Write an interface called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

68, which contains 4

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods

public Ball(float x, float y, int radius, int speed, int directionInDegree)

70,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

71,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

72 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

73, as shown in the class diagram. Also write an implementation class called

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

Ex: Movable Interface and its Implementation Classes MovablePoint and MovableCircle

Write an interface called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

68, which contains 4

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods

public Ball(float x, float y, int radius, int speed, int directionInDegree)

70,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

71,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

72 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

73, as shown in the class diagram. Also write the implementation classes called

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

83. Mark all the overridden methods with annotation

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

10.

Ex: Interfaces Resizable and GeometricObject

Write the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

85 called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

62, which declares two

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods:

public Ball(float x, float y, int radius, int speed, int directionInDegree)

88 and

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

9, as specified in the class diagram.
Hints:

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

Write the implementation class

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2, with a protected variable

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1, which implements the interface

public Ball(float x, float y, int radius, int speed, int directionInDegree)

62.
Hints:

Write a test program called

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

6 to test the methods defined in

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

The class

public Ball(float x, float y, int radius, int speed, int directionInDegree)

95 is defined as a subclass of the class

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

2, which also implements an interface called

public Ball(float x, float y, int radius, int speed, int directionInDegree)

97, as shown in class diagram. The interface

public Ball(float x, float y, int radius, int speed, int directionInDegree)

97 declares an

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 method

public Author (String name, String email, char gender) {......}

00, which modifies the dimension (such as

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

1) by the given percentage. Write the interface

public Ball(float x, float y, int radius, int speed, int directionInDegree)

97 and the class

public Ball(float x, float y, int radius, int speed, int directionInDegree)

95.
Hints:

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

Write a test program called

public Author (String name, String email, char gender) {......}

04 to test the methods defined in

public Ball(float x, float y, int radius, int speed, int directionInDegree)

95.

Ex: Abstract Superclass Animal and its Implementation Subclasses

Write the codes for all the classes shown in the class diagram. Mark all the overridden methods with annotation @Override.

Ex: Another View of Abstract Superclass Animal and its Implementation Subclasses

Examine the following codes and draw the class diagram.

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

Explain the outputs (or error) for the following test program.

Ex: Interface Movable and its implementation subclasses MovablePoint and MovableCircle

Suppose that we have a set of objects with some common behaviors: they could move up, down, left or right. The exact behaviors (such as how to move and how far to move) depend on the objects themselves. One common way to model these common behaviors is to define an interface called

public Author (String name, String email, char gender) {......}

06, with

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods

public Ball(float x, float y, int radius, int speed, int directionInDegree)

70,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

71,

public Ball(float x, float y, int radius, int speed, int directionInDegree)

72 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

73. The classes that implement the

public Author (String name, String email, char gender) {......}

06 interface will provide actual implementation to these

public Ball(float x, float y, int radius, int speed, int directionInDegree)

35 methods.

Let's write two concrete classes -

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42 and

public Ball(float x, float y, int radius, int speed, int directionInDegree)

83 - that implement the Movable interface.

The code for the interface

public Author (String name, String email, char gender) {......}

06 is straight forward.

For the

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42 class, declare the instance variable

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57,

public Author (String name, String email, char gender) {......}

20 and

public Author (String name, String email, char gender) {......}

21 with package access as shown with

public Author (String name, String email, char gender) {......}

22 in the class diagram (i.e., classes in the same package can access these variables directly). For the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

83 class, use a

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42 to represent its center (which contains four variable

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

55,

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

57,

public Author (String name, String email, char gender) {......}

20 and

public Author (String name, String email, char gender) {......}

21). In other words, the

public Ball(float x, float y, int radius, int speed, int directionInDegree)

83 composes a

Ball[(1.1,2.2),speed=(3.3,4.4)]
Ball[(80.0,35.0),speed=(4.0,6.0)]
x is: 80.0
y is: 35.0
radius is: 5
xDelta is: 4.0
yDelta is: 6.0
Ball[(84.0,41.0),speed=(4.0,6.0)]
Ball[(88.0,47.0),speed=(4.0,6.0)]
Ball[(92.0,41.0),speed=(4.0,-6.0)]
Ball[(96.0,35.0),speed=(4.0,-6.0)]
Ball[(92.0,29.0),speed=(-4.0,-6.0)]
Ball[(88.0,23.0),speed=(-4.0,-6.0)]
Ball[(84.0,17.0),speed=(-4.0,-6.0)]
Ball[(80.0,11.0),speed=(-4.0,-6.0)]
Ball[(76.0,5.0),speed=(-4.0,-6.0)]
Ball[(72.0,-1.0),speed=(-4.0,-6.0)]
Ball[(68.0,5.0),speed=(-4.0,6.0)]
Ball[(64.0,11.0),speed=(-4.0,6.0)]
Ball[(60.0,17.0),speed=(-4.0,6.0)]
Ball[(56.0,23.0),speed=(-4.0,6.0)]
Ball[(52.0,29.0),speed=(-4.0,6.0)]

42, and its

Account[id=A101,name=Tan Ah Teck,balance=88]
Account[id=A102,name=Kumar,balance=0]
ID: A101 
Name: Tan Ah Teck
Balance: 88 
Account[id=A101,name=Tan Ah Teck,balance=188]
Account[id=A101,name=Tan Ah Teck,balance=138]
Amount exceeded balance
Account[id=A101,name=Tan Ah Teck,balance=138]
Account[id=A101,name=Tan Ah Teck,balance=38]
Account[id=A102,name=Kumar,balance=100]

Write a test program and try out these statements:

Write a new class called

public Author (String name, String email, char gender) {......}

32, which composes two

public Author (String name, String email, char gender) {......}

33 (representing the top-left and bottom-right corners) and implementing the

public Author (String name, String email, char gender) {......}

06 Interface. Make sure that the two points has the same speed.

What is the difference between an interface and an abstract class?

More Exercises on OOP

Ex: The Discount System

You are asked to write a discount system for a beauty saloon, which provides services and sells beauty products. It offers 3 types of memberships: Premium, Gold and Silver. Premium, gold and silver members receive a discount of 20%, 15%, and 10%, respectively, for all services provided. Customers without membership receive no discount. All members receives a flat 10% discount on products purchased (this might change in future). Your system shall consist of three classes:

Employee[id=8,name=Peter Tan,salary=2500]
Employee[id=8,name=Peter Tan,salary=999]
id is: 8
firstname is: Peter
lastname is: Tan
salary is: 999
name is: Peter Tan
annual salary is: 11988
1098
Employee[id=8,name=Peter Tan,salary=1098]

42,

public Author (String name, String email, char gender) {......}

36 and

public Author (String name, String email, char gender) {......}

37, as shown in the class diagram. It shall compute the total bill if a customer purchases $x of products and $y of services, for a visit. Also write a test program to exercise all the classes.

The class

public Author (String name, String email, char gender) {......}

38 contains only

01/02/2014
09/12/2099
Month: 12
Day: 9
Year: 2099
03/04/2016

24 variables and methods (underlined in the class diagram).

Ex: Polyline of Points with ArrayList

A polyline is a line with segments formed by points. Let's use the

public Author (String name, String email, char gender) {......}

40 (dynamically allocated array) to keep the points, but upcast to

public Author (String name, String email, char gender) {......}

41 in the instance variable. (Take note that array is of fixed-length, and you need to set the initial length).

InvoiceItem[id=A101,desc=Pen Red,qty=888,unitPrice=0.08]
InvoiceItem[id=A101,desc=Pen Red,qty=999,unitPrice=0.99]
id is: A101
desc is: Pen Red
qty is: 999
unitPrice is: 0.99
The total is: 989.01

Exercises on Data Structures

Ex: MyIntStack

A stack is a first-in-last-out queue. Write a program called

public Author (String name, String email, char gender) {......}

42, which uses an array to store the contents, restricted to

Rectangle[length=1.2,width=3.4]
Rectangle[length=1.0,width=1.0]
Rectangle[length=5.6,width=7.8]
length is: 5.6
width is: 7.8
area is: 43.68
perimeter is: 26.80

81.

What kind of data is the colors of the cars around the gym in the scenario

More Basic OOP Concepts

Ex: Yet Another Circle Class

Ex: The Rectangle Class

Ex: The Employee Class

Ex: The InvoiceItem Class

Ex: The Account Class

Ex: The Date Class

Ex: The Time Class

Ex: The Ball Class

Exercises on Composition

(Advanced) The Author and Book Classes Again - An Array of Objects as an Instance Variable

Ex: The Author and Book Classes - Your Turn

Ex: The Customer and Invoice classes

Ex: The Customer and Account classes

Ex: The MyPoint Class

Ex: The MyLine and MyPoint Classes

Ex: The MyCircle and MyPoint Classes

Ex: The MyTriangle and MyPoint Classes

Ex: The MyRectangle and MyPoint Classes

More Exercises on Classes

Ex: The MyComplex class

Ex: The MyPolynomial Class

Ex: Using JDK's BigInteger Class

Ex: The MyTime Class

Ex: The MyDate Class

Ex: Bouncing Balls - Ball and Container Classes

Ex: The Ball and Player Classes

Exercises on Inheritance

An Introduction to OOP Inheritance by Example - The Circle and Cylinder Classes

Ex: Superclass Person and its subclasses

Ex: Point2D and Point3D

Hints:

Ex: Point and MovablePoint

Hints

Ex: Superclass Shape and its subclasses Circle, Rectangle and Square

Ex: Superclass Animal and its subclasses

Exercises on Composition vs Inheritance

Ex: The Point and Line Classes

Ex: The Circle and Cylinder Classes Using Composition

Exercises on Polymorphism, Abstract Classes and Interfaces

Ex: Abstract Superclass Shape and Its Concrete Subclasses

Ex: GeometricObject Interface and its Implementation Classes Circle and Rectangle

Ex: Movable Interface and its Implementation MovablePoint Class

Ex: Movable Interface and its Implementation Classes MovablePoint and MovableCircle

Ex: Interfaces Resizable and GeometricObject

Ex: Abstract Superclass Animal and its Implementation Subclasses

Ex: Another View of Abstract Superclass Animal and its Implementation Subclasses

Ex: Interface Movable and its implementation subclasses MovablePoint and MovableCircle

More Exercises on OOP

Ex: The Discount System

Ex: Polyline of Points with ArrayList

Exercises on Data Structures

Ex: MyIntStack

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