非继承类的复用

public class fuyong {
	/*
	 * 通过非继承 来对其他方法 进行复用
	 * */
	public static void main(String[] args) {
		Animal animal = new Animal();
		Bird bird = new Bird(animal);
		bird.beat();
	}
}
class  Animal{
	public void beat () {
		System.out.println("animal beat");
	}
}
class Bird{
	 private Animal animal ;
	 public Bird(Animal animal) {
		 this.animal = animal;
	}
	 void beat() {
		 animal.beat();
	 }
}