java类中定义接口

今天看到一个java类中定义了接口，写个备忘录，记录一下

 1 package com.gxf.test;
 2
 3 public class Test_interface {
 4     public interface show{
 5         public void show();
 6     }
 7     static class TestInterface implements show{
 8
 9         @Override
10         public void show() {
11             System.out.println("this is interface!");
12
13         }
14
15     }
16
17     public static void main(String []args){
18         TestInterface testInterface = new TestInterface();
19         testInterface.show();
20     }
21 }