5 程序在执行过程中，如果出现异常，默认情况锁会被释放。

比眉伴天荒 2024-04-18 17:37 20阅读 0赞

![a58d3e44c75a4ee743d0efe351d888a98c4.jpg][]

会拿到只改了一半的数据。

public class T {
       int count = 0;
       synchronized void m() {
          System.out.println(Thread.currentThread().getName() + " start");
          while(true) {
             count ++;
             System.out.println(Thread.currentThread().getName() + " count = " + count);
             try {
                TimeUnit.SECONDS.sleep(1);
                
             } catch (InterruptedException e) {
                e.printStackTrace();
             }
             
             if(count == 5) {
                int i = 1/0; //此处抛出异常，锁将被释放，要想不被释放，可以在这里进行catch，然后让循环继续
                System.out.println(i);
             }
          }
       }
       
       public static void main(String[] args) {
          T t = new T();
          Runnable r = new Runnable() {
    
             @Override
             public void run() {
                t.m();
             }
             
          };
          new Thread(r, "t1").start();
          
          try {
             TimeUnit.SECONDS.sleep(3);
          } catch (InterruptedException e) {
             e.printStackTrace();
          }
          
          new Thread(r, "t2").start();
       }
       
    }

![3edbf9a3c035e504438c4ef4a3cc8039adc.jpg][]

\*\*解决：如果不想释放这把锁，请加上try...catch\*\*

转载于:https://my.oschina.net/u/4131327/blog/3057482

[a58d3e44c75a4ee743d0efe351d888a98c4.jpg]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/c4c136362843476fbf571eb655bfc1c5.jpg
[3edbf9a3c035e504438c4ef4a3cc8039adc.jpg]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/c7b0737e0e1943dca57b46a85c9c8a1a.jpg