I haven't done too much Swing programming in a while and I didnt
normally throw away panels within Frames, so was wondering
if someone had the right answer for the following.

I have 1 frame that contains several panels.
I want to replace a panel of buttons,
do I have to remove listeners before removing the panel
in order to free all memory do I

Currently all I have is:
        if ( buttonPanel != null ) {
            frame.getContentPane().remove(buttonPanel);
        }

The buttonPanel is created with code like:
    ...
        buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(row, col));

        for (Iterator i = moves.iterator(); i.hasNext();) {
        ...
            Button button = new Button( ... );
            button.addActionListener( new Doer( ... );
            buttonPanel.add(button);
        }
        frame.getContentPane().add(BorderLayout.SOUTH, buttonPanel);

Note, the "Doer" is an inner class that only refers to the outer class
(the controller class containing the above code) and any appropriate
parts of the model class.

Is the correct way in JDK 1.4 or beyond require anything more than the
above remove() before I start building another button panel?

A JDK 1.4 reference on how to what to do with components when you
are done with them would be good.  I couldn't find a useful page
on the subject. Here is a recent page which seems to suggest that just
the remove is fine:
http://forum.java.sun.com/thread.jspa?messageID=3021730

thanks,
-Paul