When I enter keyboard input into the JFormattedTextField object, the input
is not being retained when the field has lost focus.

I am using SDK/JRE 1.4.0, Windows XP Professional.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.text.MaskFormatter;
import java.text.ParseException;
public class TestFrame extends JFrame
{
public JFormattedTextField low;
public JFormattedTextField high;
public JFormattedTextField incr;

public TestFrame() {

 JPanel panel = new JPanel(new BorderLayout());

 // add selection panel
 MaskFormatter mf1 = null;
 MaskFormatter mf2 = null;
 try
 {
  mf1 = new MaskFormatter("####");
     mf1.setPlaceholderCharacter('_');
  mf2 = new MaskFormatter("###");
     mf2.setPlaceholderCharacter('_');
     }
     catch (ParseException e){
    }

 low = new JFormattedTextField(mf1);
 high = new JFormattedTextField(mf1);
 incr = new JFormattedTextField(mf2);

 JPanel select = new JPanel(new GridBagLayout());
 GridBagConstraints gbc = new GridBagConstraints();
 gbc.fill = GridBagConstraints.NONE;
 addgbc(select, new JLabel("Low Temperature Range . . ."),gbc,0,0);
 addgbc(select, low,gbc,1,0);
 addgbc(select, new JLabel("High Temperature Range  . ."),gbc,0,1);
 addgbc(select, high,gbc,1,1);
 addgbc(select, new JLabel("Increment Degrees . . . . ."),gbc,0,2);
 addgbc(select, incr,gbc,1,2);
 panel.add(select, BorderLayout.NORTH);
 JFrame frame = new JFrame("Test JFormattedTextField");
 frame.getContentPane().setLayout(new BorderLayout());
 frame.getContentPane().add(panel, BorderLayout.NORTH);
 frame.pack();
 frame.setVisible(true);

}
private void addgbc(Container cont, JComponent comp, GridBagConstraints
gbc, int x, int y) {
 gbc.gridx=x; gbc.gridy=y;
 cont.add(comp,gbc);
}
public static void main (String[] args) {

 new TestFrame();
}

}