Java学习笔记----------------守护线程

/*
* Copyright (c) 2013. Designed By BaiQiang.All Right Reserved.
*/

package com.bq;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
* Created with IntelliJ IDEA.
* User: 白强
* Date: 13-12-7
* Time: 下午11:56
* 当线程只剩下守护线程的时候，JVM就会退出.
* 但是如果还有其他的任意一个用户线程还在，JVM就不会退出.
*/
public class DaemonRunner implements  Runnable{
@Override
public void run() {
while (true) {
for (int i = 1; i <= 50; i++) {

System.out.println(i);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) throws IOException {
Thread daemonThread = new Thread(new DaemonRunner());
// 设置为守护进程
daemonThread.setDaemon(true);
daemonThread.start();
System.out.println("isDaemon = " + daemonThread.isDaemon());
BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
// 接受输入，使程序在此停顿，一旦接受到用户输入,main线程结束，JVM退出!
bf.readLine();
//AddShutdownHook方法增加JVM停止时要做处理事件：
//当JVM退出时，打印JVM Exit语句.
Runtime.getRuntime().addShutdownHook(new Thread(){
@Override
public void run() {
System.out.println("JVM Exit!");
}
});
}
}