JAVA守护线程与用户线程的区别

public class DaemonTest {

    public static void main(String[] args) {
        new WorkerThread().start();
        try {
            Thread.sleep(7500);
        } catch (InterruptedException e) {}
        System.out.println("Main Thread ending") ;
    }

}
class WorkerThread extends Thread {

    public WorkerThread() {
        setDaemon(true) ;   // When false, (i.e. when it's a user thread),
                // the Worker thread continues to run.
                // When true, (i.e. when it's a daemon thread),
                // the Worker thread terminates when the main 
                // thread terminates.
    }

    public void run() {
        int count=0 ;
        while (true) {
            System.out.println("Hello from Worker "+count++) ;
            try {
                sleep(5000);
            } catch (InterruptedException e) {}
        }
    }
}

守护线程应用示例：java garbage collection。当没有线程运行时，不会产生垃圾，garbage collection也就没有发挥作用，JVM可以关闭。

守护线程应用背景：后台线程（比如可以收集某些系统状态的线程，发送email的线程，等不希望影响JVM的事情）

JAVA守护线程与用户线程的区别

原文：http://blog.csdn.net/aaashen/article/details/45227363