Problem: Develop the \'Shape\' application such that: - Implement an array of ob

Question

Problem: Develop the 'Shape' application such that:

- Implement an array of objects of various types ( all SIX classes), in anyorder.

- In some type of a looping structure, demostrate polumorphism by calling all three of the methods, draw, move, and erase. That is, withing the curly braces, there will be only three method calls.

- Verify that the output messages come from all three methods, from all seven classes.

-The only class that you should have to develop for this class will be the test application. The six shape classes from Lab-7 should remain unchanged.

***In reference to this code (LAB 7)****

public class Shape {
   //Default constructor
   public Shape() {
       System.out.println(":: Shape Object is created ::");
   }
   //draw method
   public void draw()
   {
   System.out.println("Shape - draw method");  
   }
   //Move method
   public void move()
   {
       System.out.println("Shape - move method");      
   }
   //erase method
   public void erase()
   {
       System.out.println("Shape - move method");
   }
}

___________________________________

public class Rectangle extends Shape
{
   //Default constructor
public Rectangle()
{
   System.out.println(":: Rectangle Object is created ::");
}
//Overriding the draw method
@Override
public void draw()
   {
   System.out.println("Rectangle - draw method");  
   }
//Overriding the move method
@Override
   public void move()
   {
       System.out.println("Rectangle - move method");      
   }
//Overriding the erase method
@Override
   public void erase()
   {
       System.out.println("Rectangle - move method");
   }
}

______

public class Ellipse extends Shape
{
   //Default constructor
public Ellipse()
{
   System.out.println(":: Ellipse Object is created ::");
}
//Overriding the draw method
@Override
public void draw()
   {
   System.out.println("Ellipse - draw method");  
   }
//Overriding the move method
@Override
   public void move()
   {
       System.out.println("Ellipse - move method");      
   }
//Overriding the erase method
@Override
   public void erase()
   {
       System.out.println("Ellipse - move method");
   }
}

______________________________

public class Triangle extends Shape {
   //Default constructor
public Triangle()
{
   System.out.println(":: Triangle Object is created ::");
}
//Overriding the draw method
@Override
public void draw()
   {
   System.out.println("Triangle - draw method");  
   }
//Overriding the move method
@Override
   public void move()
   {
       System.out.println("Triangle - move method");      
   }
//Overriding the erase method
@Override
   public void erase()
   {
       System.out.println("Triangle - move method");
   }
}

______

public class Square extends Rectangle
{
   //Default constructor
public Square()
{
   System.out.println(":: Square Object is created ::");
}
//Overriding the draw method
@Override
public void draw()
   {
   System.out.println("Square - draw method");  
   }
//Overriding the move method
@Override
   public void move()
   {
       System.out.println("Square - move method");      
   }
//Overriding the erase method
@Override
   public void erase()
   {
       System.out.println("Square - move method");
   }
}

__________________________________________

public class Circle extends Ellipse {
   //Default constructor
public Circle()
{
   System.out.println(":: Circle Object is created ::");
}
//Overriding the draw method
@Override
public void draw()
   {
   System.out.println("Circle - draw method");  
   }
//Overriding the move method
@Override
   public void move()
   {
       System.out.println("Circle - move method");      
   }
//Overriding the erase method
@Override
   public void erase()
   {
       System.out.println("Circle - move method");
   }
}

________________________________________

public class ShapeTest {

   public static void main(String[] args) {
       //Creating the Shape class Object
       Shape s=new Shape();
       s.draw();
       s.erase();
       s.move();
       //Creating the Rectangle class Object
       Rectangle r=new Rectangle();
       r.draw();
       r.erase();
       r.move();
       //Creating the Ellipse class Object
       Ellipse e=new Ellipse();
       e.draw();
       e.erase();
       e.move();
       //Creating the Triangle class Object
       Triangle t=new Triangle();
       t.draw();
       t.erase();
       t.move();
       //Creating the Square class Object
       Square sq=new Square();
       sq.draw();
       sq.erase();
       sq.move();
       //Creating the Circle class Object
       Circle c=new Circle();
       c.draw();
       c.erase();
       c.move();
      
   }

}

Explanation / Answer

Hi, I have modified the code as per your requirement.

ShapeTest.java

public class ShapeTest {
   public static void main(String[] args) {
   //Creating the Shape class Object Array
       Shape shapesArr[] = new Shape[6];
       shapesArr[0] = new Shape();
       shapesArr[1] = new Rectangle();
       shapesArr[2] = new Ellipse();
       shapesArr[3] = new Triangle();
       shapesArr[4] = new Square();
       shapesArr[5] = new Circle();
       for(int i=0; i<shapesArr.length; i++){
   Shape s = shapesArr[i];
   s.draw();
   s.erase();
   s.move();
       }
  
   }
   }
     

Output:

:: Shape Object is created ::
:: Shape Object is created ::
:: Rectangle Object is created ::
:: Shape Object is created ::
:: Ellipse Object is created ::
:: Shape Object is created ::
:: Triangle Object is created ::
:: Shape Object is created ::
:: Rectangle Object is created ::
:: Square Object is created ::
:: Shape Object is created ::
:: Ellipse Object is created ::
:: Circle Object is created ::
Shape - draw method
Shape - move method
Shape - move method
Rectangle - draw method
Rectangle - move method
Rectangle - move method
Ellipse - draw method
Ellipse - move method
Ellipse - move method
Triangle - draw method
Triangle - move method
Triangle - move method
Square - draw method
Square - move method
Square - move method
Circle - draw method
Circle - move method
Circle - move method

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