How does one include a counter in an applet?

Question

By counter, I mean you have a number in a label or text box and up/down arrows immediately to the right of it, when you press the down arrow the number goes down and vice versa for the up arrow.

Answer 1

I added a window listener so the default close operation for the
window manager can be used. The previous was not able to respond
to window manager events.
import java.awt.*;
import java.awt.event.*;
public class Counter extends Frame implements ActionListener {
private Label label;
private Button up, down;
private static int number = 0;
public Counter() {
     super("Test");
     setLayout(new FlowLayout());
     label = new Label(Integer.toString(number));
     up = new Button("Up");
     down = new Button("Down");
     add(label);
     add(up);
     add(down);
     up.addActionListener(Counter.this);
     down.addActionListener(Counter.this);
     addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) { dispose();}
     pack();
     setVisible(true);
public void actionPerformed(ActionEvent ae) {
     if (ae.getSource() == up) {
     label.setText(Integer.toString(++number));
     if (ae.getSource() == down) {
     label.setText(Integer.toString(--number));
public static void main(String args[]) {
     new Counter();
This below should do it. It does not listen for a
default close so
you might have to stop it by doing a Control-C.
This was compiled with and works with SDK 1.4.1_02.
import java.awt.*;
import java.awt.event.*;
public class Counter extends Frame implements
ActionListener {
private Label label;
private Button up, down;
private static int number = 0;
public Counter() {
super("Test");
setLayout(new FlowLayout());
label = new
label = new Label(Integer.toString(number));
up = new Button("Up");
down = new Button("Down");
add(label);
add(up);
add(down);
up.addActionListener(Counter.this);
down.addActionListener(Counter.this);
pack();
setVisible(true);
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == up) {
label.setText(Integer.toString(++number));
if (ae.getSource() == down) {
label.setText(Integer.toString(--number));
public static void main(String args[]) {
new Counter();