雖然項目用不上，先備份吧，控制多線程執行順序有兩種方法

1.通過join方法保證多線程的順序性的特性

join：讓主線程等待子線程結束後才能繼續執行

public  static void main(String[] args) throws InterrupterException
{
    thread1.start();
    thread1.join();
    thread2.start();
    thread2.join();
    thread3.star();
}

2.
ExcutorService executor = Excutors.newSingleTheadExcutor():FIFO

static ExcutorService excutorService = Excutors.newSingleTheadExcutor();
public  static void main(String[] args) throws InterrupterException
{
    excutorService.submit(thread1);
    excutorService.submit(thread2);
    excutorService.submit(thread3);
}

控制多線程執行順序