结构型模式之装饰者模式

 1 /**
 2  * Component
 3  * 抽象构件
 4  */
 5 public interface Person {
 6 
 7     void eat();
 8 }
 9 
10 /**
11  * ConcreteComponent
12  * 具体构件
13  */
14 public class Man implements Person {
15 
16     @Override
17     public void eat() {
18         System.out.println("男人在吃");
19     }
20 }
21 
22 /**
23  * Decorator
24  * 抽象装饰类
25  */
26 public abstract class Decorator implements Person {
27 
28     protected Person person;
29     
30     public void setPerson(Person person) {
31         this.person = person;
32     }
33     
34     @Override
35     public void eat() {
36         person.eat();
37     }
38 }
39 
40 /**
41  * ConcreteDectrator
42  * 具体装饰类
43  */
44 public class ManDecoratorA extends Decorator {
45 
46     @Override
47     public void eat() {
48         super.eat();
49         reEat();
50         System.out.println("ManDecoratorA类");
51     }
52 
53     public void reEat() {
54         System.out.println("再吃一顿饭");
55     }
56 }
57 
58 
59 /**
60  * ConcreteDectrator
61  * 具体装饰类
62  */
63 public class ManDecoratorB extends Decorator {
64     
65     @Override
66     public void eat() {
67         super.eat();
68         System.out.println("===============");
69         System.out.println("ManDecoratorB类");
70     }
71 }
72 
73 
74 /**
75  * client
76  */
77 public class Client {
78 
79     public static void main(String[] args) {
80         Man man = new Man();
81         ManDecoratorA md1 = new ManDecoratorA();
82         ManDecoratorB md2 = new ManDecoratorB();
83 
84         md1.setPerson(man);
85         md2.setPerson(md1);
86         md2.eat();
87     }
88 }