Question

Problem: Develop the ‘Shape’ application such that:

· ‘Rectangle’, ‘Ellipse’, and ‘Triangle’ classes inherit from the ‘Shape’ class.

· Develop the ‘Square’ and ‘Circle’ class where ‘Square’ inherits from ‘Rectangle’ and ‘Circle’ inherits from ‘Ellipse’. ‘Triangle’ has no derived class.

· For each class, implement the overridden methods ‘draw’, ‘move’, and ‘erase’. Each method should only have an output statement such as “Rectangle – draw method” that will be displayed when the method is invoked.

· Implement the default constructors for each class with a corresponding message to be displayed when invoked. No initializations are required; that is, the output message will be the only executable statement in the constructors.

· Do not implement any other methods for these classes ( i.e., ‘toString’, ‘equals’, getters and setters ).

· Implement a ‘ShapeTest’ class which will instantiate an object of each class.

· Exercise each of the ‘draw’, ‘move’, and ‘erase’ methods of each class

· Remember to make sure that there is only a single class per file.

Answer 1

Answer:

ShapeTest.java

public class ShapeTest
{

public static void main(String args[])
{
Square s =new Square();
s.draw();
s.erase();
s.move();
Circle c=new Circle();
c.draw();
c.erase();
c.move();

Traingle t=new Traingle();
t.draw();
t.erase();
t.move();
  
}}

Shape.java
class Shape{
protected String name;
protected String phoneNumber;
Shape()
{
System.out.println("shape class constructor");
}
public void draw()
{
System.out.println("shape draw mwthod");
}
public void move()
{
System.out.println("shape move mwthod");
}
public void erase()
{
System.out.println("shape erase mwthod");
}
  
}

Rectangle.java
class Rectangle extends Shape
{
Rectangle()
{
System.out.println("Rectangle class constructor");
}
public void draw()
{
System.out.println("rectangle draw mwthod");
}
public void move()
{
System.out.println("rectangle move mwthod");
}
public void erase()
{
System.out.println("rectangle erase mwthod");
}
  
}

Traingle.java
class Traingle extends Shape
{
Traingle()
{
System.out.println("Traingle class constructor");
}
public void draw()
{
System.out.println("traingle draw mwthod");
}
public void move()
{
System.out.println("traingle move mwthod");
}
public void erase()
{
System.out.println("traingle erase mwthod");
}
  
}

Ellipse.java
class Ellipse extends Shape
{
Ellipse()
{
System.out.println("Ellipse class constructor");
}
public void draw()
{
System.out.println("ellipse draw mwthod");
}
public void move()
{
System.out.println("ellipse move mwthod");
}
public void erase()
{
System.out.println("ellipse erase mwthod");
}
  
}

Square.java

class Square extends Rectangle
{
Square()
{
System.out.println("Square class constructor");
}
public void draw()
{
System.out.println("square draw mwthod");
}
public void move()
{
System.out.println("square move mwthod");
}
public void erase()
{
System.out.println("square erase mwthod");
}
  
}

Circle.java
class Circle extends Ellipse
{
Circle()
{
System.out.println("Circle class constructor");
}
public void draw()
{
System.out.println("circle draw mwthod");
}
public void move()
{
System.out.println("circle move mwthod");
}
public void erase()
{
System.out.println("circle erase mwthod");
}
  
}