Question

我想配置一个基于分钟计划的java系统，但每次执行操作时，它都会停止，不会根据分钟运行下一个操作。

public static void main(String[] args) throws ParseException {
    // TODO code application logic here
    Timer timer = new Timer();
    TimerTask tt = new TimerTask() {
        @Override
        public void run() {

            Calendar cal = Calendar.getInstance(); //this is the method you should use, not the Date(), because it is deprecated.

            int min = cal.get(Calendar.MINUTE);//get the hour number of the day, from 0 to 23
            try {

                if (min == 17) {                      
                    System.out.println("doing the scheduled task at " + min);
                    this.cancel();
                }

                if (min == 18) {                        
                    System.out.println("doing the scheduled task at " + min);
                    this.cancel();

                }
            } catch (Exception e) {
                System.out.println("Error Occurs " + e.getMessage());
            }
        }
    };

    timer.schedule(tt, 1000, 1000);//   delay the task 1 second, and then run task every one second

}

请帮助:(

Answer 1

if (min == 17) {                      
     System.out.println("doing the scheduled task at " + min);
     this.cancel();
}

this.cancel（）是罪魁祸首

Here is the description

public boolean cancel（）

取消此计时器任务。如果任务已安排为一次性执行但尚未运行，或尚未安排，则它将永远不会运行。如果任务已安排重复执行，则它将永远不会再运行。

希望这会有所帮助

Java使用计时器按分钟设置计划和执行操作（连续运行）

1 个答案: