JComboBox and JFormattedTextField

Question

Hi ppl.
I'm trying to set up an input mask in my editable combo.
I tried this:
JTextField editorComponent = (JTextField) combo.getEditor().getEditorComponent();
DefaultFormatterFactory factory = new DefaultFormatterFactory(fmtData);
((JFormattedTextField) (JTextField) editorComponent).setFormatterFactory(factory);
and got on runtime
javax.swing.plaf.metal.MetalComboBoxEditor$1 cannot be cast to javax.swing.JFormattedTextField
I tried that and got the same problem:
JFormattedTextField ftf = new JFormattedTextField(fmtData);
combo.setEditor((ComboBoxEditor) ftf);
javax.swing.JFormattedTextField cannot be cast to javax.swing.ComboBoxEditor
How to handle this errors or how to set up an input mask for combo editor by another way?
Thanks in advance.

Answer 1

maybe with this one you can..., but you have to implements change ItemValue
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.math.RoundingMode;
import java.text.Format;
import java.text.NumberFormat;
public class NumberJComboBox implements ComboBoxEditor {
    private JFormattedTextField field;
    private NumberFormat format;
    private JComboBox cb;
    private JFrame frm;
    public NumberJComboBox(Format f) {
        field = new JFormattedTextField(f);
    @Override
    public void addActionListener(ActionListener l) {
    @Override
    public void removeActionListener(ActionListener l) {
    @Override
    public Component getEditorComponent() {
        return field;
    @Override
    public void selectAll() {
    @Override
    public void setItem(Object value) {
        field.setValue(value);
    @Override
    public Object getItem() {
        return field.getValue();
    public NumberJComboBox() {
        format = NumberFormat.getNumberInstance();
        format.setMinimumFractionDigits(2);
        format.setMaximumFractionDigits(2);
        format.setRoundingMode(RoundingMode.HALF_UP);
        NumberJComboBox ncb = new NumberJComboBox(format);
        Double dbl[] = {1002.22, 154.22, 15.4578, 1000.0, 100.00, 0.12};
        cb = new JComboBox(dbl);
        cb.setEditable(true);
        cb.setEditor(ncb);
        frm = new JFrame();
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.getContentPane().add(cb);
        frm.pack();
        frm.setVisible(true);
    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                NumberJComboBox calc = new NumberJComboBox();
}