SCAbstract1.java

abstract class Shape
{
 abstract public double perimeter();
 abstract public double area();
}

class Circle extends Shape
{
 double radius;
 
 public double perimeter()
 {
 return 2*Math.PI*radius;
 }
 public double area()
 {
 return Math.PI*radius*radius;
 }
 
}
 
class Rectangle extends Shape
{
 double length;
 double breadth;
 
 public double perimeter()
 {
 return 2*(length+breadth);
 }
 public double area()
 {
 return length*breadth;
 }
 
}

public class SCAbstract1 
{
 public static void main(String[] args) 
 {
 Rectangle r=new Rectangle();
 r.length=10;
 r.breadth=5;
 Circle c=new Circle();
 c.radius=15;
 Shape s=c;
 System.out.println(s.area());
 } 
}