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Thread: ActionListener in Java

  1. #1
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    Default ActionListener in Java

    I wonder whether everything else stops while ActionListener running?
    If I loop a button ActionListener when this button is pressed, I can not invoke another button ActionListener
    I want to toggle 2 actions of 2 buttons:
    - Press btn1 --> do btn1 ActionListener
    { Flag1 = true, Flag2 = false
    while Flag1 = true, do action1
    }

    - Press btn2 --> do btn2 ActionListener
    { Flag1 = false, Flag2 = true
    while Flag2 = true, do action2
    }

    But when invoke btn1, everything else is out of control

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: ActionListener in Java

    everything else stops while ActionListener running
    ActionListeners run on the Event Dispatch Thread which is the same thread used by Swing. If any code running on the EDT uses too much time, the responsiveness of all GUI components will be delayed until the code using the EDT ends.

    If there is a need for a long running task, better to have the code for that task run on its own, separate thread.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: ActionListener in Java

    Quote Originally Posted by Norm View Post
    ActionListeners run on the Event Dispatch Thread which is the same thread used by Swing. If any code running on the EDT uses too much time, the responsiveness of all GUI components will be delayed until the code using the EDT ends.

    If there is a need for a long running task, better to have the code for that task run on its own, separate thread.
    In this case, if a button invokes to sound a midi note, how can you prolong the sound until you click the button STOP or another button?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: ActionListener in Java

    Does the class that makes the sound have methods to call to stop the sound?
    If the code that makes the sound is run on another thread, not the EDT, then buttons will be responsive and their action listeners can call the method to stop the sound.
    If you don't understand my answer, don't ignore it, ask a question.

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