Re: Inline Listeners

Robert Klemme <>
Mon, 11 Jun 2007 16:43:51 +0200
On 11.06.2007 16:25, Jason Cavett wrote:

I am added listeners (DocumentListener) to a GUI component
(specifically a class that extends JTextField). I am wondernig why
listeners can be instantiated WITHOUT knowing any of the information
within the listener. For example...

                    new DocumentListener() {
                        public void changedUpdate(DocumentEvent e) {
                            if (fireEvent) {

                        public void insertUpdate(DocumentEvent e) {
                            if (fireEvent) {

                        public void removeUpdate(DocumentEvent e) {
                            if (fireEvent) {

                        private void update() {

This listener is added when the GUI is instantiated, however, it is
not until later that I set the dataModel. Why does this work? (I
realize this is probably a fundamental question, but since I never
understood it fully, I figured I would ask.)

Your anonymous class inherits a reference to the instance of the
surrounding class. Your method commonUpdate() are invoked on that
instance; same for fields ("nameTextField" in this case).

Kind regards


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