Setup application

Question

I'm building a setup application which copies a big file to the target machine.
How must I modify the ProgressBarDemo code (from this site) in order to show the progress of copying files ?
Thanks for help.
ProgressBarDemo code
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ProgressBarDemo extends JFrame {
public final static int ONE_SECOND = 1000;
private JProgressBar progressBar;
private Timer timer;
private JButton startButton;
private LongTask task;
private JTextArea taskOutput;
private String newline = "\n";
public ProgressBarDemo() {
super("ProgressBarDemo");
task = new LongTask();
//Create the demo's UI.
startButton = new JButton("Start");
startButton.setActionCommand("start");
startButton.addActionListener(new ButtonListener());
progressBar = new JProgressBar(0, task.getLengthOfTask());
progressBar.setValue(0);
progressBar.setStringPainted(true);
taskOutput = new JTextArea(5, 20);
taskOutput.setMargin(new Insets(5,5,5,5));
taskOutput.setEditable(false);
JPanel panel = new JPanel();
panel.add(startButton);
panel.add(progressBar);
JPanel contentPane = new JPanel();
contentPane.setLayout(new BorderLayout());
contentPane.add(panel, BorderLayout.NORTH);
contentPane.add(new JScrollPane(taskOutput), BorderLayout.CENTER);
contentPane.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
setContentPane(contentPane);
//Create a timer.
timer = new Timer(ONE_SECOND, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
progressBar.setValue(task.getCurrent());
taskOutput.append(task.getMessage() + newline);
taskOutput.setCaretPosition(
taskOutput.getDocument().getLength());
if (task.done()) {
Toolkit.getDefaultToolkit().beep();
timer.stop();
startButton.setEnabled(true);
progressBar.setValue(progressBar.getMinimum());
* The actionPerformed method in this class
* is called when the user presses the start button.
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent evt) {
startButton.setEnabled(false);
task.go();
timer.start();
public static void main(String[] args) {
JFrame frame = new ProgressBarDemo();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.pack();
frame.setVisible(true);
}

Answer 1

How would WE know?