android:Thread.join()

使用场景：

存在两个线程，线程2的执行需要依赖线程1的完整数据，可利用join方法控制线程1结束后线程2再开始。

使用示例：

class ThreadTesterA implements Runnable {

private int counter;

@Override
public void run() {
while (counter <= 10) {
System.out.print("Counter = " + counter + " ");
counter++;
}
System.out.println();
}
}

class ThreadTesterB implements Runnable {

private int i;

@Override
public void run() {
while (i <= 10) {
System.out.print("i = " + i + " ");
i++;
}
System.out.println();
}
}

public class ThreadTester {
public static void main(String[] args) throws InterruptedException {
Thread t1 = new Thread(new ThreadTesterA());
Thread t2 = new Thread(new ThreadTesterB());
t1.start();
t1.join(); // wait t1 to be finished
t2.start();
t2.join(); // in this program, this may be removed
}
}

t1启动后，调用join()方法，直到t1的计数任务结束，才轮到t2启动，然后t2也开始计数任务。可以看到，实例中，两个线程就按着严格的顺序来执行了。

转载自：/article/7970799.html