java timer - how to scheduletask at a particular time in the future.

Question

Hi Everyone,

I have used java.util.Timer to schedule TimerTask to be run every 2 hours .

But how do I schedule a task to run say everynight at 2 am ?

This might be something easy, I am just overlooking something I guess.

Thanks in Advance

Answer 1

You could use the Quartz scheduling system with a CronTrigger.

Answer 2

Call

timer.scheduleAtFixedRate(task, twoAmDate, twentyFourHoursInMillis )

on java.util.Timer

Answer 3

You can make your own Thread to do this.
Use something like:

boolean todayExecuted = false;
while (true)
{
   Date now = new Date();
   if (now.getHours() == 2)
   {
      if (!todayExecuted)
      {
          todayExecuted = true;
          doTask(); // The call to the method you want to execute at 2 am
      }
   }
   if (now.getHours() == 0)
   {
       todayExecuted = false;
   }
   try { Thread.sleep(216000000L); } catch(Exception e) {} // Wait 1 hour
}