Adding KeyListeners to JPanel not working

Adding KeyListeners to JPanel not working

I've just completed an online tutorial on making a networked game. The
game it's self is just a small circle that follows the mouse when on the
screen.
I've been modifying the code to use keys to move the circle instead of the
mouse. However whilst I've done this before I've never used "JPanel" and
I'm struggling to get the keys to move the circle around.
The game's 'client' side only consists of two files, Client.java and
DataPackage.java, the problem (to my knowledge) appears to be in
Client.java.
I wont paste the whole code as it is quite big (i will if you think it is
necessary), but here is the bit that makes the ball follow the mouse
public Client()
{
this.addMouseMotionListener(new MouseMotionListener()
{
@Override
public void mouseDragged(MouseEvent e)
{
x = e.getX();
y = e.getY();
}
@Override
public void mouseMoved(MouseEvent e) {}
});
}
now I've tried just changing
this.addMouseMotionListener(new MouseMotionListener()
{
@Override
public void mouseDragged(MouseEvent e)
{
x = e.getX();
y = e.getY();
}
@Override
public void mouseMoved(MouseEvent e) {}
});
to
this.addKeyListener(new KeyListener() {
public void keyPressed(KeyEvent e) { System.out.println(
"tester"); }
public void keyReleased(KeyEvent e) {
System.out.println("2test2"); }
public void keyTyped(KeyEvent e) {
System.out.println("3test3"); }
});
but this didn't appear to work, then i tried changing the location of the
keying code by putting it outside of the
public Client() { }
Then I thought it could be the 'implements' tags at the top of the file.
so I added
implements KeyListener
to the end of
public class Client extends JComponent
but again, this did not work then I did some more research and it seems
that I need to set the panel to be focused by using
panel.setFocusable(true);
but the source of this information, failed to say where to put it and
everywhere I put it throws an error
Can someone shed some light on this for me please?