Java Concurrency/Threads——join详解
Posted isguoqiang
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参考自:https://www.cnblogs.com/enjiex/p/3661551.html
1. Java Thread join 方法作用:
将当前线程A变为wait,执行join操作的线程B直到B结束。如果该B线程在执行中被中断.
2. join方法的三个重载:
public final void join();//此方法会把当前线程变为wait,直到执行join操作的线程结束,如果该线程在执行中被中断,则会抛出InterruptedException
public final synchronized void join(long milis); //此方法会把当前线程变为wait,直到执行join操作的线程结束或者在执行join后等待millis的时间。因为线程调度依赖于操作系统的实现,因为这并不能保证当前线程一定会在millis时间变为RUnnable。
public final synchronized void join(long milis, int nanos); //此方法会把当前线程变为wait,直到执行join操作的线程结束或者在join后等待millis+nanos的时间。
package com.guoqiang;
import static com.guoqiang.ThreadColor.*;
public class Main
public static void main(String[] args)
Thread t1 = new Thread(new MyRunnable(), "t1");
Thread t2 = new Thread(new MyRunnable(), "t2");
Thread t3 = new Thread(new MyRunnable(), "t3");
t1.start();
//start second thread after waiting for 2 seconds or if it's dead
try
t1.join(2000);
catch (InterruptedException e)
e.printStackTrace();
t2.start();
//start third thread only when first thread is dead
try
t1.join();
catch (InterruptedException e)
e.printStackTrace();
t3.start();
//let all threads finish execution before finishing main thread
try
t1.join();
t2.join();
t3.join();
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("All threads are dead, exiting main thread");
class MyRunnable implements Runnable
@Override
public void run()
System.out.println("Thread started:::"+Thread.currentThread().getName());
try
Thread.sleep(4000);
catch (InterruptedException e)
e.printStackTrace();
System.out.println("Thread ended:::"+Thread.currentThread().getName());
OUT:
Thread started:::t1
Thread started:::t2
Thread ended:::t1
Thread started:::t3
Thread ended:::t2
Thread ended:::t3
All threads are dead, exiting main thread
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