oop.修饰词/内部类/重写

 1 package oo.day05;
 2 //内部类演示
 3 public class InnerDemo {
 4     public static void main(String[] args) {
 5         Mama m = new Mama();
 6         //Baby b = new Baby(); //编译错误，内部类对外不具备可见性
 7     }
 8 }
 9 
10 class Mama{ //外部类
11     private String name;
12     Baby createBaby(){
13         return new Baby();
14     }
15     class Baby{ //内部类
16         void showMamaName(){
17             System.out.println(name); //简略写法
18             System.out.println(Mama.this.name);
19             //System.out.println(this.name); //编译错误
20         }
21     }
22 }