63 内部类

 1 class Test1_InnerClass{
 2     public static void main(String[] args) {
 3         Outer.Inner oi = new Outer().new Inner();
 4         oi.show();
 5     }
 6 }
 7 
 8 class Outer{
 9     public int num  = 30;
10     class Inner{
11         public int num = 20;
12         public void show(){
13             int num = 10;
14             System.out.println(num);
15             System.out.println(this.num);
16             System.out.println(Outer.this.num);
17         }
18     }
19 }