1 class Animal
 2 {
 3     private String name;
 4     Animal(String name)
 5     {
 6         this.name=name;
 7     }
 8     public void enjoy()
 9     {
10         System.out.println("叫声。。。");
11     }
12 }
13 class Cat extends Animal
14 {
15     private String eyeColor;
16     Cat(String n,String eyeColor)
17     {
18         super(n);
19         this.eyeColor=eyeColor;
20     }
21     public void enjoy()
22     {
23         System.out.println("猫叫声。。。");
24     }
25 }
26 class Dog extends Animal
27 {
28     private String furColor;
29     Dog(String n,String furColor)
30     {
31         super(n);
32         this.furColor=furColor;
33     }
34     public void enjoy()
35     {
36         System.out.println("狗叫声。。。");
37     }
38 }
39 /*
40 class Bird extends Animal
41 {
42     Bird()
43     {
44         super("bird");
45     }
46     public void enjoy()
47     {
48         System.out.println("鸟叫声。。。");
49     }
50 }*/
51 class Lady
52 {
53     private String name;
54     private Animal Pet;
55     Lady(String name,Animal Pet)
56     {
57         this.name=name;
58         this.Pet=Pet;
59     }
60     public void petEnjoy()
61     {
62         Pet.enjoy();
63     }
64 }
65 class Test
66 {
67     public static void main(String [] args)
68     {
69         Cat c=new Cat("catname","blue");
70         Dog d=new Dog("dogname","black");
71         //Bird b=new Bird();
72         Lady L1=new Lady("L1",c);
73         Lady L2=new Lady("L2",d);
74         //Lady L3=new Lady("L3",b);
75         L1.petEnjoy();
76         L2.petEnjoy();
77         //L3.petEnjoy();
78     }
79 }
80 /*
81 F:\java_example\lesson6>java Test
82 猫叫声。。。
83 狗叫声。。。
84 */