HashMap陷入死循环的例子

//使用这个例子可以模拟HashMap陷入死循环的效果，可能需要执行多次才会出现。
 1 package com.hanzi;

 import java.util.HashMap;

 public class HashMapInfiniteLoop {
     private HashMap hash = new HashMap(500);

     public HashMapInfiniteLoop() {
         Thread t1 = new Thread() {
             public void run() {
                 for (int i = 0; i < 500000; i++) {
                     hash.put(new Integer(i), Integer.valueOf(i));
                 }
                 System.out.println("t1 over");
             }
         };
         Thread t2 = new Thread() {
             public void run() {
                 for (int i = 0; i < 500000; i++) {
                     hash.put(new Integer(i),Integer.valueOf(i));
                 }
                 System.out.println("t2 over");
             }
         };
         t1.start();
         t2.start();
     }

     public static void main(String[] args) {
         new HashMapInfiniteLoop();
     }
 }