java - 同时运行多个线程然后运行主线程

Question

我必须 || 运行多个线程，并在执行完所有这些线程后主线程继续。比如我有1个主线程和3个子线程，我的需求是

run main thread
pause main thread
run all 3 sub threads ||ly
after complition resume main thread

我创建了一个类 extends Thread 并调用了所有这些线程的启动方法，但这并没有解决我的问题。

我的代码:

for (MyThread myThread : myThreads) {
    myThread.start();
}

感谢您的帮助。

Answer 1

尝试使用 Thread.join();

public class ThreadDemo implements Runnable {

   public void run() {

      Thread t = Thread.currentThread();
      System.out.print(t.getName());
      //checks if this thread is alive
      System.out.println(", status = " + t.isAlive());
   }

   public static void main(String args[]) throws Exception {

      Thread t = new Thread(new ThreadDemo());
      // this will call run() function
      t.start();
      // waits for this thread to die
      t.join();
      System.out.print(t.getName());
      //checks if this thread is alive
      System.out.println(", status = " + t.isAlive());
   }
} 

输出:

Thread-0, status = true
Thread-0, status = false

这是一个stack-over-flow link供引用。