线程中join用法

1 join()  当前线程中出现 thread1.join()  会先执行完thread1 然后再执行当前线程

public static void main(String[] args) {
        final Thread threadN = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("产品经理正在规划新需求...");
            }
        });

        final Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    thread1.join();
                    System.out.println("开发人员开发新需求功能");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

        final Thread thread3 = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    thread2.join();
                    System.out.println("测试人员测试新功能");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

        try {
            System.out.println("产品经理来上班了");
            System.out.println("测试人员来上班了");
            System.out.println("开发人员来上班了");
            thread1.start();
            //在父进程调用子进程的join()方法后，父进程需要等待子进程运行完再继续运行。
            System.out.println("开发人员和测试人员休息会...");
            thread1.join();
            System.out.println("产品经理新需求规划完成!");
            thread2.start();
            System.out.println("测试人员休息会...");
            thread2.join();
            thread3.start();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }