Apps Java Applet Left Keyevent does not work

[ugur]

I was making a game applet but when i run the game the right Key works but then the left key doesnt respont

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class StartingPoint extends Applet implements Runnable, KeyListener {

private Image i;
private Graphics doubleG;
Ball b, b2;

@Override
public void init() {
setSize(800, 600);
addKeyListener(this);

}

@Override
public void start() {
b = new Ball();
b2 = new Ball(250, 250);
Thread thread = new Thread(this);

thread.start();

}

@Override
public void run() {
// TODO Auto-generated method stub
// Thread information
while (true) {
b.update(this);
b2.update(this);

repaint();
try {
Thread.sleep(17);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

@Override
public void stop() {

}

@Override
public void destroy() {

}

@Override
public void update(Graphics g) {
if (i == null) {
i = createImage(this.getSize().width, this.getSize().height);
doubleG = i.getGraphics();
}
doubleG.setColor(getBackground());
doubleG.fillRect(0, 0, this.getSize().width, this.getSize().height);

doubleG.setColor(getForeground());
paint(doubleG);

g.drawImage(i, 0, 0, this);

}

@Override
public void paint(Graphics g) {
b.paint(g);
b2.paint(g);
}

@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
b.moveLeft();
break;

case KeyEvent.VK_RIGHT:
b.moveRight();
break;

}
}

@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}

@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}

}