java线程挂起（join）

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1、线程挂起join简介

将另外一个线程join到当前线程，则需要等到join进来的线程执行完才会继续执行当前线程。

thread.join(); //当前线程挂起，调用线程 thread，在thread线程执行完毕之前，当前线程一直挂起不执行。
thread.join(1000); //当前线程挂起，调用线程 thread，等待 thread 线程，等待时间是1000毫秒，超过这个时间，当前线程进入可运行状态。

2、代码事例

package com.xxx.util;import java.util.Date;import java.util.concurrent.TimeUnit;/** * Created with IntelliJ IDEA. * Date: 15-3-27 * Time: 上午9:38 * To change this template use File | Settings | File Templates. */public class ThreadJoin1 implements  Runnable{    @Override    public void run() {        System.out.printf("Beginning threadJoin1 loading:%s\n",new Date());        try {            TimeUnit.SECONDS.sleep(6);        } catch (InterruptedException e) {            System.out.println("ThreadJoin1 has bean interrupted");        }        System.out.println("ThreadJoin1 loading has finished.");    }}

package com.xxx.util;import java.util.Date;import java.util.concurrent.TimeUnit;/** * Created with IntelliJ IDEA. * Date: 15-3-27 * Time: 上午9:38 * To change this template use File | Settings | File Templates. */public class ThreadJoin2 implements  Runnable{    @Override    public void run() {        System.out.printf("Beginning threadJoin2 loading:%s\n",new Date());        try {            TimeUnit.SECONDS.sleep(4);        } catch (InterruptedException e) {            System.out.println("ThreadJoin2 has bean interrupted");        }        System.out.println("ThreadJoin2 loading has finished.");    }}

main类

package com.xxx.util;import java.util.Date;/** * Created with IntelliJ IDEA. * Date: 15-3-27 * Time: 上午9:44 * To change this template use File | Settings | File Templates. */public class ThreadJoinMain {    public static void main(String[] args){        Thread threadJoin1 = new Thread(new ThreadJoin1());        Thread threadJoin2 = new Thread(new ThreadJoin2());        threadJoin1.start();        threadJoin2.start();        try {            //main线程等待threadJoin1线程1秒，超过一秒，main线程进入可运行状态            threadJoin1.join(1000);            threadJoin2.join();        } catch (InterruptedException e) {            System.out.println("Handle InterruptedException.");        }        System.out.printf("%s：Configuration has bean loaded：%s\n",Thread.currentThread().getName(),new Date());    }}

3、运行结果

4、结论

当前线程挂起等待。

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