Pr2c.java

interface Shape {
  double area();
  double perimeter();
}

class Circle implements Shape {

  private double radius;

  public Circle(double radius) {
    this.radius = radius;
  }

  @Override
  public double area() {
    return Math.PI * radius * radius;
  }

  @Override
  public double perimeter() {
    return 2 * Math.PI * radius;
  }
}

public class Pr2c {

  public static void main(String args[]) {
    Circle c = new Circle(12.0);
    System.out.println("Circle Area:" + c.area());
    System.out.println("Circle Perimeter:" + c.perimeter());
  }
}