Sides.java

abstract class Shape
{
 abstract void numberofsides();
}
class Trapezoid extends Shape
{
 void numberofsides()
 {
 System.out.println("Number of sides of Trapeziod is : 4");
 }
}
class Triangle extends Shape
{
 void numberofsides()
 {
 System.out.println("Number of sides of Triangle is : 3");
 }
}
class Hexagon extends Shape
{
 void numberofsides()
 {
 System.out.println("Number of sides of Hexagon is : 6");
 }
}
class Sides
{
 public static void main(String args[])
 {
 Shape s;
 s=new Trapezoid();
 s.numberofsides();
 s=new Triangle();
 s.numberofsides();
 s=new Hexagon();
 s.numberofsides(); 
 
 }
}