Can you link values for two JFormattedTextFields?

Question

I\'ve got an interface with 2 JFormattedTextFields for which I need the values (not just the displayed text) to be identical. Ideally they should both be editable, with a chang

Answer 1

You can use a key listener. You simply add a key listener to both fields using the below code. the reason you need the other events is it will throw errors unless you have them in the code.

import javax.swing.*;   
import java.awt.*;  
import java.awt.event.*;

public class CreateGrid 
{    
    JFrame thisframe;
    JFormattedTextField jFormattedTextField1, jFormattedTextField2;

    public CreateGrid()
    {
        GridLayout thislayout = new GridLayout(0,2);
        thisframe = new JFrame();
        thisframe.setLayout(thislayout);

        jFormattedTextField1 = new JFormattedTextField();
        jFormattedTextField2 = new JFormattedTextField();
        jFormattedTextField1.addKeyListener(new KeyAdapter()
        {
            public void keyReleased(KeyEvent e) 
            {                
                JFormattedTextField textField = (JFormattedTextField) e.getSource();
                String text = textField.getText();
                jFormattedTextField2.setText(text);
            }
            public void keyTyped(KeyEvent e) 
            {
            }
            public void keyPressed(KeyEvent e) 
            {
            }            
        });
        jFormattedTextField2.addKeyListener(new KeyAdapter()
        {
            public void keyReleased(KeyEvent e) 
            {                
                JFormattedTextField textField = (JFormattedTextField) e.getSource();
                String text = textField.getText();
                jFormattedTextField1.setText(text);
            }
            public void keyTyped(KeyEvent e) 
            {
            }
            public void keyPressed(KeyEvent e) 
            {
           }            
       });
       thisframe.add(jFormattedTextField1);
       thisframe.add(jFormattedTextField2);
       thisframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       thisframe.setVisible(true);
       thisframe.pack();
   }

public static void main(String args[])
{
    new CreateGrid();
}    

} I have tested this out and it works perfectly what ever you type into one field will show up in the other as you type it.