Issues with ActionListener and KeyListener, what am i doing wrong?

Question

basically the program will complie, but not run properly, in appletviewer or a browser. The code for the buttons will be added later, but the test code seems to be working ok. The code for KeyListener does not move the square in the applet as it should, and when i close the applet it will dump a long error message to the dos window. if i comment out Action listener then KeyListener will work fine. if i comment out KeyListener then the applet will close with no error message to the dos window.
i'm new to java and i don't know if i am doing anything wrong. please help, thankyou.
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class Project22 extends Applet implements KeyListener, ActionListener {
private int score = 0;
private int speed = 5;
private int [] frame = {500, 500};
private int [] sqr_loc = {235, 235};
private char keyinput;
private Button new_b = new Button("New Ball");
private Button ext_app = new Button("Exit");
private int junk = 0; // debug
private Label message = new Label("start"); // debug
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if(source == new_b) {    // not coded yet
++junk;
message.setText(Integer.toString(junk));
else if(source == ext_app) {     // not coded yet
++junk;
message.setText(Integer.toString(junk));
public void keyTyped(KeyEvent event) {}
public void keyPressed(KeyEvent event) {
     int keycode = event.getKeyCode();
if(keycode == KeyEvent.VK_RIGHT) {
if(sqr_loc[0] < 475) {
sqr_loc[0] += speed;
repaint();
else if(keycode == KeyEvent.VK_LEFT) {
if(sqr_loc[0] > 0) {
sqr_loc[0] -= speed;
repaint();
else if(keycode == KeyEvent.VK_UP) {
if(sqr_loc[1] > 0) {
sqr_loc[1] -= speed;
repaint();
else if(keycode == KeyEvent.VK_DOWN) {
if(sqr_loc[1] < 475) {
sqr_loc[1] += speed;
repaint();
public void keyReleased(KeyEvent event) {}
public void paint(Graphics g) {
g.drawRect(sqr_loc[0], sqr_loc[1], 25, 25);
}     // end paint
public void init() {
add(new_b);
add(ext_app);
add(message);
new_b.addActionListener(this);
ext_app.addActionListener(this);
addKeyListener(this);
requestFocus();
}     // end Project22

Answer 1

Perhaps the error message can help to determine the problem?