How to schedule a periodic task in Java?

I need to schedule a task to run in at fixed interval of time. How can I do this with support of long intervals (for example on each 8 hours)?

I'm currently using java.util.Timer.scheduleAtFixedRate . Does java.util.Timer.scheduleAtFixedRate support long time intervals?

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使用ScheduledExecutorService：

 private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
 scheduler.scheduleAtFixedRate(yourRunnable, 8, 8, TimeUnit.HOURS);

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你应该看看Quartz它是一个Java EE框架，适用于EE和SE版本，并允许定义作业来执行特定的时间

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Try this way ->

Firstly create a class TimeTask that run your task, it looks like:

 public class CustomTask extends TimerTask  {

   public CustomTask(){

     //Constructor

   }

   public void run() {
    try {

         // Your task process

            } catch (Exception ex) {

        System.out.println("error running thread " + ex.getMessage());
    }
}

then in main class you instantiate the task and run it periodically started by a specified date:

 public void runTask(){

        Calendar calendar = Calendar.getInstance();
        calendar.set(
           Calendar.DAY_OF_WEEK,
           Calendar.MONDAY
        );
        calendar.set(Calendar.HOUR_OF_DAY, 15);
        calendar.set(Calendar.MINUTE, 40);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);



        Timer time = new Timer(); // Instantiate Timer Object

        // Start running the task on Monday at 15:40:00, period is set to 8 hours
        // if you want to run the task immediately, set the 2nd parameter to 0
        time.schedule(new CustomTask(), calendar.getTime(), TimeUnit.HOURS.toMillis(8));
}

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