Weird keylistener problem...

Question

I just upgraded my java to 1.4.2 which caused this problem i believe. I add an action listener with the following code:
    this.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        main_keyPressed(e);
    });This worked fine in an older version of java, but in 1.4.2 it doesnt get my keyinput from the frame. 'this' refers to my class that extends JFrame... Im not sure what is wrong... maybe I added it to the wrong object even though it worked fine with another version of java.
Thanks for your help,
CoW

Answer 1

If a control on the JFrame has the focus it needs to have the KeyListener, as in the appended code. In this case the JFrame passes the KeyStokes off to the JTextArea before the JFrame KeyListener sees them. Change the ta to this on line 14 and you will see no more KeyEvents.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class TestKey extends JFrame
     Container cp;
     JTextArea ta;
     TestKey()
          cp = getContentPane();
         ta = new JTextArea(20,80);
          ta.addKeyListener(new java.awt.event.KeyAdapter()
                public void keyPressed(KeyEvent e)
                     main_keyPressed(e);
          cp.add(ta,BorderLayout.CENTER);
          pack();
     void main_keyPressed(KeyEvent e)
          System.out.println(e);
     static public void main(String[] args)
          TestKey tk;
          tk = new TestKey();
          tk.show();