Please help me in compiling the enclosed java code

Question

Iam trying to compile the below mentioned java code and iam getting this error: I have Weblogic 6.1 + sp2 installed on my machine. Please help !
The error is :
C:\bea\jdk131>javac Browser.java
Browser.java:17: cannot resolve symbol
symbol : class JIconButton
location: class Browser
private JIconButton homeButton;
^
Browser.java:25: cannot resolve symbol
symbol : class ExitListener
location: class Browser
addWindowListener(new ExitListener());
^
Browser.java:26: cannot resolve symbol
symbol : variable WindowUtilities
location: class Browser
WindowUtilities.setNativeLookAndFeel();
^
Browser.java:30: cannot resolve symbol
symbol : class JIconButton
location: class Browser
homeButton = new JIconButton("home.gif");
^
4 errors
THE CODE IS HERE :
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class Browser extends JFrame implements HyperlinkListener,
ActionListener {
public static void main(String[] args) {
if (args.length == 0)
new Browser("http://www.apl.jhu.edu/~hall/");
else
new Browser(args[0]);
private JIconButton homeButton;
private JTextField urlField;
private JEditorPane htmlPane;
private String initialURL;
public Browser(String initialURL) {
super("Simple Swing Browser");
this.initialURL = initialURL;
addWindowListener(new ExitListener());
WindowUtilities.setNativeLookAndFeel();
JPanel topPanel = new JPanel();
topPanel.setBackground(Color.lightGray);
homeButton = new JIconButton("home.gif");
homeButton.addActionListener(this);
JLabel urlLabel = new JLabel("URL:");
urlField = new JTextField(30);
urlField.setText(initialURL);
urlField.addActionListener(this);
topPanel.add(homeButton);
topPanel.add(urlLabel);
topPanel.add(urlField);
getContentPane().add(topPanel, BorderLayout.NORTH);
try {
htmlPane = new JEditorPane(initialURL);
htmlPane.setEditable(false);
htmlPane.addHyperlinkListener(this);
JScrollPane scrollPane = new JScrollPane(htmlPane);
getContentPane().add(scrollPane, BorderLayout.CENTER);
} catch(IOException ioe) {
warnUser("Can't build HTML pane for " + initialURL
+ ": " + ioe);
Dimension screenSize = getToolkit().getScreenSize();
int width = screenSize.width * 8 / 10;
int height = screenSize.height * 8 / 10;
setBounds(width/8, height/8, width, height);
setVisible(true);
public void actionPerformed(ActionEvent event) {
String url;
if (event.getSource() == urlField)
url = urlField.getText();
else // Clicked "home" button instead of entering URL
url = initialURL;
try {
htmlPane.setPage(new URL(url));
urlField.setText(url);
} catch(IOException ioe) {
warnUser("Can't follow link to " + url + ": " + ioe);
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() ==
HyperlinkEvent.EventType.ACTIVATED) {
try {
htmlPane.setPage(event.getURL());
urlField.setText(event.getURL().toExternalForm());
} catch(IOException ioe) {
warnUser("Can't follow link to "
+ event.getURL().toExternalForm() + ": " + ioe);
private void warnUser(String message) {
JOptionPane.showMessageDialog(this, message, "Error",
JOptionPane.ERROR_MESSAGE);

Answer 1

I got this code from this forum concerning MONITORING some application. Iam working on writing something which can monitor the availabilty of my application on the browser. Iam not familiar with swings so i got confused with compiling this code.
Please let me know if you know some code that can help me monitor my web based application.
Thanks in advance.