装饰者模式

 1 //抽象构件接口
 2 interface Component{
 3     public void method();
 4 }
 5 
 6 //具体构件类
 7 class ConcreteComponent implements Component{
 8 
 9     @Override
10     public void method() {
11         //业务代码
12     }
13     
14 }
15 
16 //装饰者类
17 class Decorator implements Component{
18 
19     private Component component;
20     
21     public Decorator(Component component){
22         this.component = component;
23     }
24     
25     @Override
26     public void method() {
27         component.method();
28     }
29     
30 }
31 
32 //具体装饰者类
33 class DecoratorA extends Decorator{
34     
35     public DecoratorA(Component component){
36         super(component);
37     }
38     
39     public void method(){
40         super.method();
41         //其他业务代码
42     }
43 }
44 
45 class DecoratorB extends Decorator{
46     
47     public DecoratorB(Component component){
48         super(component);
49     }
50     
51     public void method(){
52         super.method();
53         //其他业务代码
54     }
55 }
56 
57 public class MyTest {
58 
59     /**
60      * @param args
61      */
62     public static void main(String[] args) {
63         Component part = new ConcreteComponent();
64         Component part1 = new DecoratorA(part);
65         Component part2 = new DecoratorA(part1);
66         part2.method();
67     }
68 
69 }