JButton Got Hanged

Hi,

Created a Bar chart for showing JVM memory status.
Toatal 30 JVM are running.
I am using JButton to refresh the bar chart to show current value.

Problem: When button pressed, all the frame got hanged until referesh button got released.

Is there any to come over this problem?

Thanks,
Ranu.

Are you aware that event handling happens in EDT? Therefore you shouldn't process logical or long-running tasks there. All other events (like repaints for instance) can only happen, after your task is finished.

To handle such things comfortably, there's a class called SwingWorker, that can be used. Look here:
http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html

If you're constricted to older java versions (< 6) maybe you could use http://foxtrot.sourceforge.net/

Thanks Peter for the quick response.
Well, i am using Java6.
Now i am looking into the SwingWorker class.

Peter Taucher wrote:Are you aware that event handling happens in EDT?

Nope Peter. Never heared about EDT.

If you never heard about 'Swing components should be accessed on the Event Dispatch Thread (EDT) only.', that would be bad for a java/swing programmer. I can remember my first prototype in Java when the managing director simply said 'You there, learn java and implement this...' so many things I didn't know then ; - )

Thanks a lot Peter for suggestion.
Will follow it.

Read the section from the Swing tutorial on Concurrency to understand how Swings Single Thread rule applies to this problem and for a working example of a SwingWorker.