clock scheduled event

Posted on 2006-07-14
Last Modified: 2011-09-20
I am trying to write a program that executes some code at a certain time.  (eg. 3:00 am)  I am using the java swing class and can not figure out how to write this.  Can someone help me out?

Question by:jmf8883
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
  • +3
LVL 23

Expert Comment

ID: 17111290
> Can someone help me out?
try using timer:

Author Comment

ID: 17111332
I have looked at that and am pretty sure I need to use it but I don't know how.  I want the event to occur at a specific time reguardless of when I start the timer.
LVL 23

Expert Comment

ID: 17111405
Try this:

        long time = System.currentTimeMillis();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.HOUR_OF_DAY, 3);
        if (cal.getTimeInMillis() < time) {
            cal.add(Calendar.DAY_OF_YEAR, 1);
        Timer timer = new Timer(24 * 60 * 60 * 1000, ...);
Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

LVL 24

Expert Comment

ID: 17111419
That only means you must schedule over the number of milliseconds
between now and then:
Use Calendar to compute the time in mSec of any moment.

LVL 24

Expert Comment

ID: 17111423
That's what I meant ...
LVL 26

Expert Comment

ID: 17112136
also make a note of this

"Although all Timers perform their waiting using a single, shared thread (created by the first Timer object that executes), the action event handlers for Timers execute on another thread -- the event-dispatching thread. This means that the action handlers for Timers can safely perform operations on Swing components. However, it also means that the handlers must execute quickly to keep the GUI responsive."

If you expect the task can be lengthy one, consider executing the task in another thread and make the GUI update calls through SwingUtilities.invokeLater(...) method.
LVL 10

Expert Comment

ID: 17112177
Have a thread which checks for the current time to be 3.0 AM ( certain time ) , then call the program you want to execute from that thread,

LVL 10

Expert Comment

ID: 17112187
In the swing class start a thread which checks for the condition,

     Calendar cal = Calendar.getInstance () ;
     if ( cal.get ( Calendar.get ( Calendar.HOUR ) == 3 )
             // call method

LVL 92

Accepted Solution

objects earned 500 total points
ID: 17112282

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question