package subtype;

public class Flock {
	public static void main(String[] args) {
		Bird bird = new Bird(0.5,"normal");
		Duck quack = new Duck();
		Bird bird2 = bird.son(quack);
		System.out.println("bird: " + bird + " quack: " + quack + " bird2: " + bird2);
		bird = quack;
		bird2 = bird.son(bird);
		System.out.println("bird: " + bird + " quack: " + quack + " bird2: " + bird2);
	}
}