HashMapがデッドサイクルに陥った例

// HashMap ， 。
 1 package com.hanzi;

 2 

 3 import java.util.HashMap;

 4 

 5 public class HashMapInfiniteLoop {

 6     private HashMap hash = new HashMap(500);

 7 

 8     public HashMapInfiniteLoop() {

 9         Thread t1 = new Thread() {

10             public void run() {

11                 for (int i = 0; i < 500000; i++) {

12                     hash.put(new Integer(i), Integer.valueOf(i));

13                 }

14                 System.out.println("t1 over");

15             }

16         };

17         Thread t2 = new Thread() {

18             public void run() {

19                 for (int i = 0; i < 500000; i++) {

20                     hash.put(new Integer(i),Integer.valueOf(i));

21                 }

22                 System.out.println("t2 over");

23             }

24         };

25         t1.start();

26         t2.start();

27     }

28 

29     public static void main(String[] args) {

30         new HashMapInfiniteLoop();

31     }

32 }