多线程学习笔记五——join机制

package day1;

import java.util.concurrent.TimeUnit;

public class Join {
    public static void main(String[] args) throws Exception {
        Thread previous = Thread.currentThread();
        for (int i = 0; i < 5; i++) {
            // 每个线程拥有前一个线程的引用，需要等待前一个线程终止，才能从等待中返回
            Thread thread = new Thread(new JoinDemo(previous), String.valueOf(i));
            thread.start();
            previous = thread;
        }
        TimeUnit.SECONDS.sleep(5);
        System.out.println(Thread.currentThread().getName() + " terminate.");
    }

    static class JoinDemo implements Runnable {
        private Thread thread;

        public JoinDemo(Thread thread) {
            this.thread = thread;
        }

        public void run() {
            try {
                thread.join();
            } catch (InterruptedException e) {
            }
            System.out.println(Thread.currentThread().getName() + " terminate.");
        }
    }
}

console输出：

main terminate.
0 terminate.
1 terminate.
2 terminate.
3 terminate.
4 terminate.

join：thread.join（）方法，当前线程会等待调用线程执行完，再继续执行