public class JoinTest {public static void main(String [] args) throws InterruptedException {ThreadJoinTest t1 = new ThreadJoinTest("小明");ThreadJoinTest t2 = new ThreadJoinTest("小东");t1.start();/**join的意思是使得放弃当前线程的执行，并返回对应的线程，例如下面代码的意思就是：程序在main线程中调用t1线程的join方法，则main线程放弃cpu控制权，并返回t1线程继续执行直到线程t1执行完毕所以结果是t1线程执行完后，才到主线程执行，相当于在main线程中同步t1线程，t1执行完了，main线程才有执行的机会*/t1.join();t2.start();}}
class ThreadJoinTest extends Thread{public ThreadJoinTest(String name){super(name);}@Overridepublic void run(){for(int i=0;i<1000;i++){System.out.println(this.getName() + ":" + i);}}
}

public class JoinTest {public static void main(String [] args) throws InterruptedException {ThreadJoinTest t1 = new ThreadJoinTest("小明");ThreadJoinTest t2 = new ThreadJoinTest("小东");t1.start();/**join方法可以传递参数，join(10)表示main线程会等待t1线程10毫秒，10毫秒过去后，* main线程和t1线程之间执行顺序由串行执行变为普通的并行执行*/t1.join(10);t2.start();}}
class ThreadJoinTest extends Thread{public ThreadJoinTest(String name){super(name);}@Overridepublic void run(){for(int i=0;i<1000;i++){System.out.println(this.getName() + ":" + i);}}
}

public class JoinTest {public static void main(String [] args) throws InterruptedException {ThreadJoinTest t1 = new ThreadJoinTest("小明");ThreadJoinTest t2 = new ThreadJoinTest("小东");/**join方法可以在start方法前调用时，并不能起到同步的作用*/t1.join();t1.start();//Thread.yield();t2.start();}}
class ThreadJoinTest extends Thread{public ThreadJoinTest(String name){super(name);}@Overridepublic void run(){for(int i=0;i<1000;i++){System.out.println(this.getName() + ":" + i);}}
}

public final synchronized void join(long millis)throws InterruptedException {long base = System.currentTimeMillis();long now = 0;if (millis < 0) {throw new IllegalArgumentException("timeout value is negative");}if (millis == 0) {while (isAlive()) {wait(0);}} else {while (isAlive()) {long delay = millis - now;if (delay <= 0) {break;}wait(delay);now = System.currentTimeMillis() - base;}}}