死锁

转载地址：http://blog.csdn.net/qq_24653023/article/details/51764451

死锁的情况 

千万不要在使用中造成这种情况

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1. package day13;  
2.   
3. class Test implements Runnable  
4. {  
5.     private boolean flag;  
6.     Test(boolean flag)  
7.     {  
8.         this.flag = flag;  
9.     }  
10.   
11.     public void run()  
12.     {  
13.           
14.         if(flag)  
15.         {  
16.             while(true)  
17.                 synchronized(MyLock.locka)  
18.                 {  
19.                     System.out.println(Thread.currentThread().getName()+"..if   locka....");  
20.                     synchronized(MyLock.lockb)              {  
21.                           
22.                         System.out.println(Thread.currentThread().getName()+"..if   lockb....");  
23.                     }  
24.                 }  
25.         }  
26.         else  
27.         {  
28.             while(true)           
29.                 synchronized(MyLock.lockb)  
30.                 {  
31.                     System.out.println(Thread.currentThread().getName()+"..else  lockb....");  
32.                     synchronized(MyLock.locka)  
33.                     {  
34.                         System.out.println(Thread.currentThread().getName()+"..else   locka....");  
35.                     }  
36.                 }  
37.         }  
38.   
39.     }  
40.   
41. }  
42. class MyLock  
43. {  
44.     public static final Object locka = new Object();  
45.     public static final Object lockb = new Object();  
46. }  
47. public class DeadLockTest   
48. {  
49.     public static void main(String[] args)   
50.     {  
51.         Test a = new Test(true);  
52.         Test b = new Test(false);  
53.   
54.         Thread t1 = new Thread(a);  
55.         Thread t2 = new Thread(b);  
56.         t1.start();  
57.         t2.start();  
58.     }  
59. }