JFormattedTextField / Formatter / OverWriteMode

Hi *

i am struggeling with a behavior of the JFormattedTextField

See example. If i type in 4 digits number values it works.
The cursor position is after the 4. digit.

If i type more numbers they will be overwritten from right to left.
I do not want this behavior.
I thought setting OverWriteMode to false should stop this, but it does not work.
Any ideas ?.

Many Thanx
Ralph

Code:

---

public class JFormattedTF extends JFrame {

  public JFormattedTF() {
    JPanel panel = new JPanel();
    JLabel label = new JLabel("Number Format :");
     
    NumberFormat nf = NumberFormat.getInstance();
    nf.setMaximumIntegerDigits(4);
    nf.setGroupingUsed(false);
 
    NumberFormatter formatter =  new NumberFormatter(nf);
    formatter.setAllowsInvalid(false);
    formatter.setOverwriteMode(false);
   
    JFormattedTextField tf = new JFormattedTextField(
        formatter);
    tf.setColumns(10);
    tf.setHorizontalAlignment(JTextField.LEFT);
    panel.add(label);
    panel.add(tf);

    getContentPane().add(panel, BorderLayout.SOUTH);
    pack();
  }

  public static void main(String[] args) {
    JFormattedTF tfe = new JFormattedTF();
    tfe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    tfe.setVisible(true);
  }
 
}

---

Hi,
No clue regarding your problem.I think some issue in Java level itself.

But,you can use MaskFormatter instead of NumberFormatter
like this below.

MaskFormatter mf = new MaskFormatter("####");

JFormattedTextField tf = new JFormattedTextField(mf);

This will allow only 4 number values.Just try it out and let me know in case of any issues.

-Regards
Ramya