java 线程方法 join

join

  public final void join() throws InterruptedException {
        join(0);
    }

该方法会一直等待直到调用的方法结束

public final synchronized void join(long millis)throws InterruptedException {}

该方法可以指定终止的最长时间

测试方法示例 1

public class MyThead implements Runnable{
    Thread t;
    public MyThead(String threadName){
        t = new Thread(this,threadName);
        System.out.println(t);
        t.start();
    }
    @Override
    public void run() {
        for(int i=0;i<5;i++){
            try {
                System.out.println(t.getName() + "\t:\t" + i);
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

   MyThead m1 = new MyThead("one");
    m1.t.join();
    System.out.println("m thread is over");

输出

Thread[one,5,main]
one	:	0
one	:	1
one	:	2
one	:	3
one	:	4
m thread is over

测试方法示例 2

MyThead m1 = new MyThead("one");
 m1.t.join(1000);
System.out.println("m thread is over");

输出

Thread[one,5,main]
one	:	0
one	:	1
m thread is over
one	:	2
one	:	3
one	:	4