KeyListener problems - wont' work?

[James Brooks]

Hi all,

I can't get this keylistener working... my jTextField does not change when I press keys while jButton1 has focus. Can anyone tell me what the heck I'm doing wrong? I've tried many different solutions, but nothing has worked.

    
  package test;
import java.awt.event.ActionListener;
import java.awt.event.KeyListener;
 import javax.swing.*;
 import java.awt.Event.*;
import java.awt.event.KeyEvent;
import java.awt.*;
 
public class NewJApplet extends javax.swing.JApplet implements KeyListener{

    /** Initializes the applet NewJApplet */
    public void init() {
        
        
        jButton1.addKeyListener(this);
        
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    initComponents();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    public void keyPressed(KeyEvent k)
    {
        Object source = k.getSource();
        if (source == jButton1)
        {
            jTextField1.setText("Hello!");
            
        }
    }
    public void keyReleased(KeyEvent k)
    {
        Object source = k.getSource();
        if (source == jButton1)
        {
            jTextField1.setText("Hello!");
            
        }
    }
    public void keyTyped(KeyEvent k)
    {
        Object source = k.getSource();
        if (source == jButton1)
        {
            jTextField1.setText("Hello!");
            
        }
    }

[James Brooks]

Hmmm, I used the NetBeans interface (right-click -> events -> keyreleased), and coded inside the method it created for me, and it works. Wonder what I was doing wrong? Oh, well...

[Ulf Dittmer]

It looks a bit as if you're adding the key listener before the components get initialized - try doing it afterwards.

[James Brooks]

Ulf Dittmer wrote:It looks a bit as if you're adding the key listener before the components get initialized - try doing it afterwards.

You're saying, before my JButton and JTextFields are initialized?

[Ulf Dittmer]

No, afterwards. It's not clear what's going on in the code because just about everything related to creating the GUI is missing, but I'm assuming that the "initComponents" method initializes the GUI. Note how the event listener is added before that (which also means that "jButton1" must have been created even before that, or you would have gotten a NullPointerException).

[James Brooks]

Ulf Dittmer wrote:No, afterwards. It's not clear what's going on in the code because just about everything related to creating the GUI is missing, but I'm assuming that the "initComponents" method initializes the GUI. Note how the event listener is added before that (which also means that "jButton1" must have been created even before that, or you would have gotten a NullPointerException).

Ah, OK, got it. Thank you!