1 class Animal
 2 {
 3     private String type;
 4     public Animal(String type){
 5         this.type = type;
 6     }
 7     public void beat(){
 8         System.out.println(this.getType()+"心脏在不停跳动。。。");
 9     }
10     public void breath(){
11         beat();
12         System.out.println(this.getType()+"呼吸中。。。");
13     }
14     public String getType(){
15         return this.type;
16     }
17 }
18 class Bird extends Animal
19 {
20     public Bird(String type){
21         super(type);
22     }
23     public void fly(){
24         System.out.println(this.getType()+"在天空自由自在的飞翔");
25     }
26 }
27 class Wolf extends Animal
28 {
29     public Wolf(String type){
30         super(type);
31     }
32     public void run(){
33         System.out.println(this.getType()+"在天空自由自在的飞翔");
34     }
35 }
36 public class AnimalTest
37 {
38     public static void main(String[] args)
39     {
40         Bird b = new Bird("鸟");
41         b.breath();
42         Wolf c = new Wolf("狼");
43         c.breath();
44     }
45 }

 2 class Animal    //该类里的方法或Filed应是复用对象共同拥有的
 3 {
 4     private String type;
 5     public Animal(String type){
 6         this.type = type;
 7     }
 8     public void beat(){
 9         System.out.println(this.getType()+"心脏在不停跳动。。。");
10     }
11     public void breath(){
12         beat();
13         System.out.println(this.getType()+"呼吸中。。。");
14     }
15     public String getType(){
16         return this.type;
17     }
18 }
19 class Bird
20 {
21     private Animal a;
22     public Bird(Animal a){
23         this.a = a;        //this.a = a = a1 = Animal@1db9742
24 }
26     public void breath(){
27         a.breath();        //a1.bteath();
28     }
29     public void fly(){
30         System.out.println((this.a).getType()+"在天空自由自在的飞翔");
31     }
32 }
33 class  Wolf
34 {
35     private Animal a;
36     public Wolf(Animal a){
37         this.a = a;        //this.a = a = a2 = Animal@106d69c
38     }
39     public void breath(){
40         a.breath();
41     }
42     public void run(){
43         System.out.println((this.a).getType()+"在陆地上自由奔跑");
44     }
46 }
47 public class CompositeTest
48 {
49     public static void main(String[] args)
50     {
51         Animal a1 = new Animal("鸟");
52         Bird b = new Bird(a1);
53         b.breath();
54         b.fly();
55         Animal a2 = new Animal("狼");
56         Wolf c = new Wolf(a2);
57         c.breath();
58         c.run();
59     }
60 }