Java设置预约性定时任务

 //预约性任务调用此方法执行定时任务  scheduleexpression为预定的时间字符串
    public void appointmentTask(String scheduleexpression){
        Thread thread=new Thread(){
            public void run(){
                appointmentSchedule(scheduleexpression);
            }
        };
        thread.start();
    }



    //预约性任务的预约定时任务
     public void appointmentSchedule(String scheduleexpression){
        while (true){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            LocalDateTime scheduleTime=LocalDateTime.parse(scheduleexpression);
            LocalDateTime nowTime=LocalDateTime.now();
            long millis = Duration.between(nowTime, scheduleTime).toMillis();
            if (nowTime.toString().equals(scheduleexpression) || millis<0){
                //这里进行要执行的操作



                break;
            }

        }
     }