关于死锁的实现与java问题定位

Posted 2021-05-14 ffzzblog

 1 package com.atguigu.boot.com.atguigu;
 2 /**
 3  * 死锁是两个或者两个以上线程争抢资源而产生的问题
 4  * 导致死锁的原因：线程相互争抢被其他线程锁定的资源，系统资源不足 进行运行推进的顺序不当 资源分配不当
 5  */
 6 class HoldLocalThread implements  Runnable
 7 {
 8     private String lockA;
 9     private String lockB;
10 
11     public HoldLocalThread(String lockA, String lockB) {
12         this.lockA = lockA;
13         this.lockB = lockB;
14     }
15     @Override
16     public void run() {
17         synchronized (lockA)
18         {
19             System.out.println(Thread.currentThread().getName()+"线程持有锁"+lockA+"\\t 尝试获取锁"+lockB);
20             synchronized (lockB)
21             {
22                 System.out.println(Thread.currentThread().getName()+"线程持有锁"+lockB+"\\t 尝试获取锁"+lockA);
23             }
24         }
25     }
26 }
27 
28 public class DeadLockDemo_55 {
29     public static void main(String[] args) {
30         String lockA="lockA";
31         String lockB="lockB";
32         new Thread(new HoldLocalThread(lockA,lockB),"ThreadAAA").start();
33         new Thread(new HoldLocalThread(lockB,lockA),"ThreadBBB").start();
34     }
35 }