1 package com.gxf.innerclass; 2  3 public class DotNew { 4     class InnerClass{                                //定义内部类 5         public String toString(){ 6             return "this is InnerClass"; 7         } 8     } 9     public static void main(String[] args) {10         DotNew dtn = new DotNew();11         InnerClass inc = dtn.new InnerClass();        //使用外部类  + .new实例化内部类12         System.out.println(inc);13     }14 15 }