package test;
/**
 * 一个类与某个类结合的很紧密，并且内部类的类名不会被其它类可见和调用，也不会产生命名冲突==
 * 
 */public class InneryClass {
 private int tt;
 
 public InneryClass(int tt){
  Square s = new Square(tt);
  this.tt = s.t;
 }
 
 class Square {
  public int t;
  public Square(int t){
   this.t = t*t;
  }
 }
 
 public static void main(String[] args) {
  InneryClass s = new InneryClass(5);
  System.out.println(s.tt);
 }}