关于守护线程和非守护线程

任何创建的一个线程，我们可以让它成为守护线程，也可以让它成为非守护线程。

创建一个守护线程代码如下：

Thread t = new Thread() t.setDaemon(true); t.start();

创建一个非守护线程代码如下：

 Thread t = new Thread() t.start();

案例一

 public static void main(String[] args) { //创建10个守护线程 for(int i=0;i<2;i++){ Thread t = new Thread(new ThreadDemo(),"thread"+i); t.setDaemon(true); t.start(); } try { Thread.sleep(10000); } catch (InterruptedException e) {} System.out.println("主线程(非守护线程运行结束)，此时守护线程也将停止运行！"); } public static class ThreadDemo implements Runnable{ public void run() { while(true){ System.out.println(Thread.currentThread().getName()+" is running."); try { Thread.sleep(2000); } catch (InterruptedException e) {} } } }

运行结果如下：

thread0 is running.
thread1 is running.
thread1 is running.
thread0 is running.
thread1 is running.
thread0 is running.
thread1 is running.
thread0 is running.
thread1 is running.
thread0 is running.
thread1 is running.
主线程(非守护线程运行结束)，此时守护线程也将停止运行！
thread0 is running.

 java程序中只要还有一个非守护线程在运行，那么其他的守护线程
 就不会结束工作，只有java程序中没有非守护线程在工作了，其他的守护线程才会停止工作。