class TimerTest01{
    public static void main(String[] args) {
        Timer timer = new Timer();
//        Timer timer = new Timer(true);//守护线程
        String firstTimeStr = "2021-05-09 17:27:00";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date firstTime = sdf.parse(firstTimeStr);
            timer.schedule(new MyTimerTask(), firstTime, 1000 * 5);//每5s执行一次
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

class MyTimerTask extends TimerTask{
    @Override
    public void run() {
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time = sdf.format(d);
        System.out.println(time + ":备份日志一次！");
    }
}