Java守护线程用法实例分析

Z时代
2024-01-10
分类：综合

本文实例讲述了Java守护线程用法。分享给大家供大家参考，具体如下：

一点睛

针对守护线程，只要有一个用户线程在执行，这个进程就不会结束。

当线程中只剩下守护线程时，JVM会自动退出，反之，如果还有其他任何用户线程存在，JVM都不会退出。

二代码


public class ThreadDaemon
{
  public static void main( String args[] )
  {
   ThreadTest t = new ThreadTest();
   Thread tt = new Thread( t );
   tt.setDaemon( true ); // 设置后台运行
   tt.start( );
   try
   { // 睡眠1毫秒，避免可能出现的没有输出的现象
     Thread.sleep( 1 );
   }
   catch( InterruptedException e )
   {
     e.printStackTrace();
   }
  }
}
class ThreadTest implements Runnable
{
  public void run()
  {
   for( int i = 0; true; ++i )
   {
     System.out.println( i + " " + Thread.currentThread().getName()
        + " is running." );
   }
  }
}

三运行

0 Thread-0 is running.
1 Thread-0 is running.
2 Thread-0 is running.
3 Thread-0 is running.
4 Thread-0 is running.
5 Thread-0 is running.
6 Thread-0 is running.
7 Thread-0 is running.
8 Thread-0 is running.
9 Thread-0 is running.
10 Thread-0 is running.
11 Thread-0 is running.
12 Thread-0 is running.
13 Thread-0 is running.
14 Thread-0 is running.
15 Thread-0 is running.
16 Thread-0 is running.
17 Thread-0 is running.
18 Thread-0 is running.
19 Thread-0 is running.
20 Thread-0 is running.
21 Thread-0 is running.
22 Thread-0 is running.
23 Thread-0 is running.
24 Thread-0 is running.
25 Thread-0 is running.
26 Thread-0 is running.
27 Thread-0 is running.
28 Thread-0 is running.