abstract class Shape

{

void numberofSides(){}

}

class Rectangle extends Shape

{

void numberofSides()

{

System.out.println("Rectangle has 4 sides.");

}

}

class Triangle extends Shape

{

void numberofSides()

{

System.out.println("Triangle has 3 sides.");

}

}

class Hexagon extends Shape

{

void numberofSides()

{

System.out.println("Hexagon has 6 sides.");

}

}

public class Sides {

public static void main(String[] args)

{

Rectangle r = new Rectangle();

r.numberofSides();

Triangle t = new Triangle();

t.numberofSides();

Hexagon h = new Hexagon();

h.numberofSides();

}

}