线程中的join()方法

public class Father{

    public static void main(String[] args){
        try {
            // 新建“线程t1”
            Son t1 = new Son("t1");

            // 启动“线程t1”
            t1.start();
            // 将“线程t1”加入到“主线程main”中，并且“主线程main()会等待它的完成”
            t1.join();
            System.out.printf("%s finish\n", Thread.currentThread().getName());
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    static class Son extends Thread{

        public Son(String name){
            super(name);
        }
        @Override
        public void run(){
            System.out.printf("%s start\n", this.getName());

            for(int i=0; i <10000; i++){
                // 延时操作
            };
            System.out.printf("%s finish\n", this.getName());
        }
    }
}

1 t1 start
2 t1 finish
3 main finish