JAVA 线程Join

join方法: 当某个线程要等待另一个线程执行结束后才能继续执行时，使用join方法。

public class DinnerThread {

	public static void main(String[] args){
		DinnerThread thread = new DinnerThread();
		Dinner fatherThread = thread.new Dinner();
		Thread myThread = new Thread(fatherThread);
		myThread.start();

	}

	public class Dinner implements Runnable
	{

		public void run() {
			System.out.println("去饭店吃饭");
			System.out.println("点完菜让饭店做菜：");
			Thread restaurantThread = new Thread(new RestaurantThread());
			restaurantThread.start();
			try {
				restaurantThread.join();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println("开始吃饭");
		}

	}

	public class RestaurantThread implements Runnable{

		public void run() {
			System.out.println("饭店开始做菜");
			for(int i=0;i<10;i++){
				System.out.println("饭店做菜("+(i+1)+")...");
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			System.out.println("饭店上菜");

		}

	}
}

　打印结果如下：

去饭店吃饭
点完菜让饭店做菜：
饭店开始做菜
饭店做菜(1)...
饭店做菜(2)...
饭店做菜(3)...
饭店做菜(4)...
饭店做菜(5)...
饭店做菜(6)...
饭店做菜(7)...
饭店做菜(8)...
饭店做菜(9)...
饭店做菜(10)...
饭店上菜
开始吃饭