java multithread之join

Join：等待该线程执行完再继续（Waits for this thread to die）

public class TestJoin {public static void main(String[] args) {CustomThread t1 = new CustomThread("t1");CustomThread t2 = new CustomThread("t2");CustomThread t3 = new CustomThread("t3");t1.start();try {t1.join();   // main thread等待t1执行完在继续执行} catch (InterruptedException e) {e.printStackTrace();}System.out.println("go on....");t2.start();t3.start();}}class CustomThread extends Thread {public CustomThread(String name){super(name);}public void run(){for(int i=0;i < 5;i++){try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread().getName() + "执行：" + (i+1));}}}

输出结果如下：

t1执行：1
t1执行：2
t1执行：3
t1执行：4
t1执行：5
go on....
t3执行：1
t2执行：1
t3执行：2
t2执行：2
t3执行：3
t2执行：3
t3执行：4
t2执行：4
t3执行：5
t2执行：5