create an Abstract Class Named Shape That Contains an empty method named NumberOfSides ( )

abstract class SHape
{
 abstract void noofsize();
}
class Triangle extends SHape
{
 void noofsize()
 {
  System.out.println("The size of triangle is 3");
 }
}
class Trapezoid extends SHape
{
 void noofsize()
 {
  System.out.println("The size of trapezoid is 4");
 }
}
class Hexagon extends SHape
{
 void noofsize()
 {
  System.out.println("The size of hexagon is 6");
 }
}
class Sha1 
{
 public static void main(String[] args) 
 {
  Triangle t=new Triangle();
  Trapezoid u=new Trapezoid();
  Hexagon v=new Hexagon();
  t.noofsize();
  u.noofsize();
  v.noofsize();
 }
}