将线程设置成后台线程Daemons 主线程结果后，后台线程将自动结果。

 

package wzh.test;import java.util.concurrent.TimeUnit; class SimpleDaemons implements Runnable{    @Override    public void run() {        try {            while (true) {                TimeUnit.MILLISECONDS.sleep(100);                System.out.println(Thread.currentThread().getId()+"  "+this);            }        } catch (Exception e) {            System.out.println("sleep() interrupted");        }    }}public class SimpleDaemonsMain{    public static void main(String[] args) throws InterruptedException {        for (int i = 0; i < 10; i++) {            Thread daemon=new Thread(new SimpleDaemons());            daemon.setDaemon(true);            daemon.start();        }        System.out.println(Thread.currentThread().getId()+"All daemons started");        TimeUnit.MICROSECONDS.sleep(175234231);    }    }