Question

I’m trying to understand which events will be managed from an event disptach thread (EDT).

Let’s assume something simple, a simple piece of code that simple opens a JOptionPane, waits for the user’s response, then closes it. What events related to this object are now put on the EDT? Is it:
a) Just the creation of the object (the JOptionPane).
b) All object related events for the lifetime of the object.
C) Something else (please specify).

Thank you,

Elliott

See below:

        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run(){
                    JOptionPane.showMessageDialog(myComponent, msg);
                }
            });
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

Answer 1

As far as I can remember, all the following “events” will be executed in the EDT:

• all events directly triggered by the end user (mouse events, key events) and all higher-level events triggered by these (action, focus…); actually you could say that all AWT and Swing EventListeners are always called in the EDT
• all painting code (as triggered by changes in components or changes in widows size or positions, whenver an area needs to be painted)
• any code called through SwingUtilities.invokeAndWait() or SwingUtilities.invokeLater().