三个线程顺序执行

    static  void  test9() throws InterruptedException{
        Thread thread1=new Thread(()->{
            try {
                System.out.println("111");
                Thread.sleep(1000);
            }catch (Exception ex){}

         });
        Thread thread2=new Thread(()->{
            try {
                System.out.println("222");
                Thread.sleep(1000);
            }catch (Exception ex){}

        });
        Thread thread3=new Thread(()->{
            try {
                System.out.println("333");
                Thread.sleep(1000);
            }catch (Exception ex){}

        });
        thread1.start();
        thread1.join();
        thread2.start();
        thread2.join();
        thread3.start();
        thread3.join();
   System.out.println("main thread end");
    }