package ӿںͳ;

public class Example6_6 {
	public static void main(String args[]) {
		Rectangle rect = new Rectangle(5, 6);
		System.out.println("Area of rect = " + rect.area());
		Circle cir = new Circle(2.0);
		System.out.println("Area of cir = " + cir.area());
	}
}

abstract class Shape2D {
	final double pi = 3.14;

	public abstract double area();
}

class Circle extends Shape2D {
	double radius;

	public Circle(double r) {
		radius = r;
	}

	public double area() {
		return (pi * radius * radius);
	}
}

class Rectangle extends Shape2D {
	int width, height;

	public Rectangle(int w, int h) {
		width = w;
		height = h;
	}

	public double area() {
		return (width * height);
	}
}