9-接口

 1 package com.example;
 2 interface A{
 3     public final String name = "xiaoyu";
 4     public abstract void tell();
 5 
 6 }
 7 
 8 class People implements A{
 9 
10     @Override
11     public void tell() {
12         System.out.print(name);
13     }
14 }
15 
16 public class MyClass {
17     //1.接口里面全部是由全局常量和公共的抽象方法所组成
18     public static void main(String[] args){
19         People p = new People();
20         p.tell();
21     }
22 }