Java接口

接口

Java的接口可以包含方法签名、常量和嵌套类，见下例：

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 1 public final class Program {
 2     public static void main(String[] args) {
 3         Playable.EMPTY.play();
 4 
 5         new Dog().play();
 6     }
 7 }
 8 
 9 interface Playable {
10     Playable EMPTY = new EmptyPlayable();
11 
12     void play();
13 
14     class EmptyPlayable implements Playable {
15 
16         @Override
17         public void play() {
18             System.out.println("无所事事");
19         }
20 
21     }
22 }
23 
24 class Dog implements Playable {
25 
26     @Override
27     public void play() {
28         System.out.println("啃骨头");
29     }
30 
31 }
​

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