Write a java program to create an abstract class named Shape that contains two integers and an empty method named printArea().

Write a java program to create an abstract class named Shape that contains two integers and an empty method named printArea(). Provide three classes named Rectangle, Triangle and Circle such that each one of the classes extends the class Shape. Each one of the classes contain only the method printArea( ) that prints the area of the given shape.

Program Code:

abstract class Shape

{

abstract void numberOfSides();

}

class Trapezoid extends Shape

{

void numberOfSides()

{

System.out.println(" Trapezoidal has four sides");

}

}

class Triangle extends Shape

{

void numberOfSides()

{

System.out.println("Triangle has three sides");

}

}

class Hexagon extends Shape

{

void numberOfSides()

{

System.out.println("Hexagon has six sides");

}

}

class ShapeDemo

{

public static void main(String args[ ])

{

Trapezoid t=new Trapezoid();

Triangle r=new Triangle();

Hexagon h=new Hexagon();

Shape s;

s=t;

s.numberOfSides();

s=r;

s.numberOfSides();

s=h;

s.numberOfSides();

}

}