验证后台线程的java多线程技术

作者：网络转载发布时间：[ 2013/5/10 9:56:52 ] 推荐标签：

　　这个程序验证了后台线程与用户线程的区别以及之间的关系，证明了只要所有的用户线程结束了，那么后台线程将必须结束！

import java.util.concurrent.TimeUnit;
public class Test {


    public static void main(String[] args){
        //将主线程的优先级设为低，优先执行main线程创建的线程
        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
        Thread myThread=new Thread(new Runnable(){
            public void run(){
                while(true)
                {
                    System.out.println("i will wait for you in shangling");
                    try {
                        TimeUnit.MILLISECONDS.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
        myThread.setDaemon(true); //设置后台线程一定要写在start()方法的前面，要不然是无效的
        myThread.setPriority(Thread.MAX_PRIORITY);
        myThread.start();
        Thread userThread = new Thread(new Runnable(){
            public void run(){
                for(int i=0;i<5;i++)
                    System.out.println("this is a user Thread");

            }
        });
        userThread.setPriority(Thread.MAX_PRIORITY);
        userThread.start();

        System.out.println("the main thread is end" );
    }
}