Writing an ActionListener that responds when a variable changes

I am interested in writing an ActionListener that monitors the value of a variable. When the value of that variable changes, I want the ActionLiastener to kick in and change what is displayed in a JLabel on the display. Note that there is no user interaction throughout this process.
Has anyone done this before or have any insight? I assume that ActionListeners are the way to go, but in case they are not, is there another way?
Thanks!

ActionListeners, by their very nature, listen for user actions; if there is no user interaction, they won't do anything. When you update the variable, why not just update the JLable too? Just make sure you do it on the Event thread (might need to use SwingUtilities.invokeLater()) and you might need to explicitly tell it to repaint itself. Hope this helps.
Jamie

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For sure it won't be updated automatically if the report is open. Did you try changing it and then see what happens?
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I'm missing something very basic here I think. What's happening is that I'm looping through a list. I also need to update that list, but since I don't want to update the list I'm looping through, I created a temporary list to hold the new values. Then after I'm done looping, I'll update my original list with my temporary list.
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               <ref>matchedAccessLevels</ref> --> [Provider Audit File - Door 3142, Cost Reports - Door 3127, Center Hall to NGS Far N Dr]
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When you are setting tempAccessLevels, you are setting it to refer to the same list object as matchedAccessLevels.
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"Sandeep Suri" <[email protected]> wrote in message
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Writing an ActionListener that responds when a variable changes

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