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 }