Poly java main method Declareinit a new object of type Trian

Poly .java main method Declare/init a new object of type Triangle Declare/init a new object of type Rectangle Declare an object of type Shape and assign it to the the triangle object Using the Shape object, call setSize method and passing arguments width/height Assign the shape object to the rectangle object Using the Shape object, call setSize method and passing arguments width/height Using the triangle object, print out the area of the triangle by calling getArea() Using the rectangle object, print out the area of the rectangle by calling getArea()

Solution

public abstract class Shape

{

private double height;

private double width;

public void setSize(double height, double width)

{

this.height=height;

this.width=width;

}

public double getHeight()

{

return height;

}

public double getWidth()

{

return width;

}

public abstract double setArea();

}

public class Rectangle extends Shape

{

public double getArea()

{

return getHeight() * getWidth();

}

}

public class Triangle extends Shape

{

public double getArea()

{

return (getHeight() * getWidth()) / 2;

}

}

Public class AbstractTest

{

public static void main (String[] args)

{

Shape shape;

Rectangle rect=new Rectangle();

shape = rect;

shape.setSize(81,4);

System.out.println(Ärea of rectangle : \"+ shape.getArea());

Triangle tri=new Triangle ();

shape=tri;

shape.setSize(47,6);

System.out.println(\"Area of triangle : \" + shape.getArea());

}

}