package com.javatest.mama;

 public class Mama {

     int x = 5;

     public static void main(String[] args){

         Mama t = new Mama();

         t.say();

         /* Baby m = new Baby(); */ //错误：No enclosing instance of type Mama is accessible

                                    //main()是静态类，而内部类是动态类

     }

     void say(){

         System.out.println("say()");

         Baby x = new Baby();

         x.show();

     }

     class Baby{

         void show(){

             System.out.println("show("+x+")");

         }

     }

 }