Re: how to remove anonymous listener?

Brandon McCombs <>
Thu, 17 Aug 2006 02:25:57 GMT
Eric Sosman wrote:

Brandon McCombs wrote:

I setup an array of combo boxes using the following (some code removed
such as layout properties):

for (int i = 0; i < cbAccountProps.length; i++) {
    cbAccountProps[i] = new JCheckBox(strAccountProps[i]);
    cbAccountProps[i].addItemListener( new ItemListener() {
        public void itemStateChanged(ItemEvent e) {

When I initialize the dialog window that this code is in the window is
automatically set to show that changes have been made to the user
whose properties are displayed in the dialog. This is because the data
is set while the listeners are active. I already have 2 methods that
go through disabling/enabling all document listeners (for a bunch of
textfields that are also in the dialog window). But I'm not sure how
to remove/add the anonymous inner class above in those same methods so
that when I set data upon the dialog opening it hasn't yet detected
changes programmatically, let alone by the operator of the
application. I have a feeling I will have to have a separate
ItemListener class setup so that I can declare an instance of it.

    You can still have an anonymous class, but you need to
remember a reference to the instance so you can pass it to
cbAccountProps[i].removeItemListener() later on.

    ItemListener[] snoops =
        new ItemListener[cbAccountProps.length];
    // ...
    for (int i = 0; i < cbAccountProps.length; i++) {
        // ...
        snoops[i] = new ItemListener() {
            public void itemStateChanged(ItemEvent e) {

    When you want to remove them, use the array that you've
carefully remembered to do

    for (int i = 0; i < cbAccountProps.length; ++i)
    // safe to discard snoops now (if they won't be
    // re-activated later)

thanks Eric. That worked great.

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