JFormattedTextField not retaining input.

From: Stuart Leonard (suncds_at_earthlink.net)
Date: 05/29/04 

Date: Sat, 29 May 2004 17:03:31 GMT

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();
 }

}