Java线程学习笔记（四）线程join-优快云博客

本文通过一个具体实例，详细解释了Java中线程join方法的作用及使用方式，展示了如何让一个线程等待另一个线程完成后再继续执行。

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《Java编程思想》的一个例子，如果某个线程在另一个线程t上调用t.join()，此线程将被挂起，直到目标线程t结束才恢复。

package com.woxiaoe.study.thread;
/**
 * 测试线程的join
 * @author 小e
 *
 * 2010-4-24 下午07:49:45
 */

class Sleeper extends Thread{
	private int sleepTimes;
	
	public Sleeper(int sleepTimes, String name) {
		super(name);
		this.sleepTimes = sleepTimes;
	}
	@Override
	public void run() {
		System.out.println(getName() + " 开始休眠");
		try {
			sleep(sleepTimes);
		} catch (InterruptedException e) {
			System.out.println(getName() + "被打断了，isInterrupted:" + isInterrupted());
		}
	}
	
}
class Joiner extends Thread{
	private Sleeper sleeper;
	public Joiner(Sleeper sleeper,String name) {
		super(name);
		this.sleeper = sleeper;
	}
	@Override
	public void run() {
		System.out.println(sleeper.getName() + "开始休眠");
		try {
			sleeper.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(sleeper.getName() + "休眠结束");
		System.out.println(getName() + "运行结束");
	}
	
}
public class Joining {
	
	public static void main(String[] args) {
		Sleeper 
			s1 = new Sleeper(2000, "s1"),
			s2 = new Sleeper(2000, "s2");
		
		Joiner
			j1 = new Joiner(s1, "j1"),
			j2 = new Joiner(s2, "j2");
		
		j2.start();
		j1.start();
		
	}

}

output：

s2开始休眠

s2休眠结束

j2运行结束

s1开始休眠

s1休眠结束

j1运行结束