Oops, sorry. I actually haven't used J*Formatted*TextField before.

I agree that it doesn't seem to be possible to be notified of a commit,
other than by using a PropertyChangeListener, as you described
previously. For what it is worth, I tried it myself, and did get the
correct new and old values from the event.

Yes, it does seem odd that you can't do this easily.

The "best" way (using best loosely), seems to be to subclass
JFormattedTextField, override commitEdit, and take whatever action you
want after you have called super().commitEdit();

public class FormattedFieldTest {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        final JFormattedTextField tf = new JFormattedTextField() {
            public void commitEdit() throws ParseException {
                super.commitEdit();
                System.out.println("New value is : " + getValue());
            }
        };
        tf.setValue(new Integer(100));
        tf.setMinimumSize(new Dimension(300, 40));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new FlowLayout());
        frame.getContentPane().add(tf);
        frame.getContentPane().add(new JButton("A button"));
        frame.pack();
        frame.setVisible(true);
    }

}

The button is added simply so that "focusLost" behaviour can be observed.

Hope this helps.

Rogan