JSpinner generates multiple change events

Question

Having problem with JSpinner generating two change events when using double values in the model. It looks like the number editor formatter is causing an event to be generated before it rounds and after it rounds.
          final JSpinner s = new JSpinner(
               new SpinnerNumberModel(20.0, 0.0, 100.0, 0.0025));
          s.setEditor(new JSpinner.NumberEditor(s, "###0.000"));
          // When value is changed, need to process certain events.
          s.addChangeListener(new ChangeListener() {
               public void stateChanged(ChangeEvent event) {
                    System.out.println("New Value:" + s.getValue());
          JFrame f = new JFrame("Test Spinner");
          f.getContentPane().setLayout(new java.awt.BorderLayout());
          f.getContentPane().add(s, java.awt.BorderLayout.CENTER);
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          f.setSize(331, 254);
          f.setVisible(true);If you modify the editor to use the following format, you can see that the two events are not generated because the formatter does not need to round:
"###0.000##############"I have to actually modify the model to round the incremented or decremented value to a precision where the formatter will not round the value, which is a pretty messy solution.
Are there any other workarounds (or solutions) that are a little more elegant?
Thanks.

Answer 1

Thanks for the reply.
This workaround reduces the amount of duplicate events, but I still see double change events that make it through the filter.
You have to filter events to get the relevant one.
See :
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=476
5246
import java.awt.*;
import java.text.*;
import javax.swing.*;
import javax.swing.event.*;
public class SpinnerEvents{
JSpinner s;
JSpinner.NumberEditor jne;
DecimalFormat dfmt;
public SpinnerEvents() {
s = new JSpinner(new SpinnerNumberModel(20.0,
0.0, 0.0, 100.0, 0.0025));
jne = new JSpinner.NumberEditor(s, "###0.000");
dfmt = jne.getFormat();
s.setEditor(jne);
// When value is changed, need to process only
only *relevant event*.
s.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent event) {
double val =
le val = ((Double)s.getValue()).doubleValue();
// ignore format event
if
if
if
if
(!(String.valueOf(val).equals(dfmt.format(val)))){
myImportantTask();
JFrame f = new JFrame("Test Spinner");
f.getContentPane().setLayout(new
(new java.awt.BorderLayout());
f.getContentPane().add(s,
d(s, java.awt.BorderLayout.NORTH);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
f.setVisible(true);
void myImportantTask(){
System.out.println("New Value:" +
:" + dfmt.format(s.getValue()));
public static void main(String[] args){
new SpinnerEvents();