Task 21: inheritance (is a)

Aim: To define a subclass from a superclass through inheritance, to invoke the superclasss constructors and methods using the super keyword, and to override instance methods in the subclass.

Title: Point, Circle and Cylinder classes

Summary: be familiar with inheritance relationship and override concept.

Question: In this task, draw inheritance hierarchy and write a complete java codes that implements the new UML class diagram according to the relationship between the three classes:

Circle

-x : int

-y : int -radius : int

To do: +constructor

To do: +overload constructor +seX (x:int): void

+setY (y:int): void +setRadius (radius:int): void +getX ():int

+getY ():int

+getRadius ():int +getDiameter ():int +getCircumference (): double +getArea (): double +printInfo (): void

Cylinder

-x : int

-y: int -radius: int -height: int

To do: +constructor

To do: +overload constructor +seX (x:int): void

+setY (y:int): void +setRadius (radius:int): void +setHeight (height:int): void +getX ():int

+getY ():int

+getRadius ():int

+getHeight ():int +getDiameter ():int +getCircumference (): double +getArea (): double +getVolume (): double +printInfo (): void

Point

-x: int -y: int

To do: +constructor

To do: +overload constructor +seX (x:int): void

+setY (y:int): void

+getX ():int

+getY ():int

+printInfo (): void

In class

- - -

In class -

-

- -

Circle

Lab Sheet 9

A0312202 Object Oriented Programming Lab (JAVA)

getDiameter ( ) method implements as follow: 2*radius getCircumference ( ) method implements as follow: PI*2*radius getArea ( ) method implements as follows: PI*radius^2

Cylinder

getDiameter ( ) method implements as follow : 2*radius (Same Implementation-no need to write it)

getCircumference ( ) method implements as follow : PI*2*radius (Same Implementation-no need to write it)

getArea ( ) method implements as follow : 2 * + PI*2*radius*height getVolume ( ) method implements as follow : *height

PI*radius^2

PI*radius^2

You will also

1- 2- 3- 4- 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15-

write a test program called Test. This will do the following:

Create an object of type Point with x=1 and y=3. Print the information of this object.

Change the value of x to be 6.

Print the new information.

Create an object of type Circle with x=1 and y=1 and radius=5. Print the information of this object.

Change the value of x to be 3.

Print the new information.

Create an object of type Cylinder with x=1 and y=2 and radius=4 and height =9. Print the new information.

Change the value of radius to be 6.

Print the new information.

Print Area of the cylinder.

Print Volume of the cylinder.

Print Circumference of the cylinder.