后台线程,守护线程(Daemon Thread)
所谓的后台线程,就是指这种线程并不属于程序中不可或缺的部分,因此当所有的非后台线程结束时,程序也就终止了,同时会杀死进程中的所有后台线程。通过setDaemon(true)来设置该线程为后台线程。
package com.csdhsm.concurrent; import java.util.concurrent.TimeUnit; /**
* @Title: SimpleDaemonThreadDemo.java
* @Package: com.csdhsm.concurrent
* @Description to test the Daemon Thread
* @author Han
* @date 2016-4-19 下午3:56:51
* @version V1.0
*/ public class SimpleDaemonThreadDemo implements Runnable{ @Override
public void run() { while(true){ System.out.println(Thread.currentThread());
try { TimeUnit.MILLISECONDS.sleep(50);
} catch (InterruptedException e) { System.out.println("sleep is intrrupted!");
}
}
} public static void main(String[] args) { for(int i = 0; i < 10; i++){ Thread t = new Thread(new SimpleDaemonThreadDemo());
//set the thread to daemon
t.setDaemon(true);
t.start();
} try {
//wait other thread to run
TimeUnit.MILLISECONDS.sleep(30);
} catch (InterruptedException e) { } System.out.println("Main thread is over");
}
}
结果
可以很清楚的看见当主线程结束之后,其他线程就没有再运行了。