How to create a Timer in swt java

Question

Hi guys I have to create a timer that every 2 seconds repeat a part of my code, can you tell me the code? I don't need the graphic on this timer.

This might be helpful http://www.java2s.com/Tutorial/Java/0280__SWT/Createtwooneshottimers2000ms.htm — Praneeth Peiris, Aug 15 '14 at 18:48
A standard way to repeat a task in java can be done using java.util.Timer and java.util.TimerTask — Frederic Close, Aug 15 '14 at 18:49
possible duplicate of [Java Timer vs ExecutorService?](http://stackoverflow.com/questions/409932/java-timer-vs-executorservice) — iwein, Aug 15 '14 at 19:04
[This answer](http://stackoverflow.com/a/16111306) should be helpful. — Baz, Aug 15 '14 at 19:21

greg-449 · Answer 1 · 2014-08-15T19:22:55.290

1

You can use java.util.concurrent.ScheduledExecutorService:

ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

scheduler.scheduleAtFixedRate(runnable, 2, 2, TimeUtil.SECONDS);

Or you can use java.util.Timer.

Or with SWT you can use:

Display.getDefault().timerExec(2000, runnable);

which guarantees that the runnable will be executed on the user interface thread. With timerExec you have to reschedule the runnable each time it runs.

runnable is an instance of the Runnable class containing the code you want to execute, for example in Java 8 you can use:

Runnable runnable = () ->
  {
    browser.refresh();

    Display.getDefault().timerExec(2000, this);
  };

for Java 7 and earlier use:

Runnable runnable = new Runnable()
 {
   public void run()
   {
     browser.refresh();

     Display.getDefault().timerExec(2000, this);
   }
 };

edited Aug 15 '14 at 19:22

answered Aug 15 '14 at 18:51

greg-449

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I have to do this istruction: browser.refresh(); which is the best? – Rick Aug 15 '14 at 18:54
1

That sounds like it needs to run on the UI thread, so `Display.timerExec` is best. – greg-449 Aug 15 '14 at 19:04
Where I have to put my code? – Rick Aug 15 '14 at 19:07
You put it at the point where you want to run something 2 seconds later. – greg-449 Aug 15 '14 at 19:10
ok, I have to create a runnable variable? because eclipse give me an error – Rick Aug 15 '14 at 19:16
`timerExec` expects an instance of `Runnable` which you have to create containing the code you want to run. – greg-449 Aug 15 '14 at 19:19
Show your code, I use this all the time – greg-449 Aug 15 '14 at 19:38

How to create a Timer in swt java

1 Answers1