How to implement event listener in background of the main program in java?

Posted by Johny on Stack Overflow See other posts from Stack Overflow or by Johny
Published on 2010-12-23T00:32:58Z Indexed on 2010/12/23 0:54 UTC
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Hi im a beginner so sorry for my question if it sounds naive.

I want to implement a thread that runs in the background and listens all the time. By listening i mean, say it keeps check on a value returned from main thread and if the vaue exceeds certain figure, it executes some method, or say exits the program.

If you could give me some idea or at least refer me to something useful, that'll be great.

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