Writing a Java Web Browser

Question

I'm trying to write a simple Java based browser. Can anyone please help me with this code. I can't get it to load the URL
please help
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
import javax.swing.event.*;
import java.lang.*;
import javax.swing.text.*;
public class Browser extends JPanel implements ActionListener {
     Browser() {
          JPanel p = new JPanel();
          p.setLayout(new BorderLayout(5,5));
          final JEditorPane jt = new JEditorPane();
          final JTextField input = new JTextField("http://java.sun.com");
          //make read only
          jt.setEditable(false);
          //follow links
          jt.addHyperlinkListener(new HyperlinkListener () {
               public void hyperlinkUpdate(
                    final HyperlinkEvent e) {
                         if (e.getEventType() ==
                              HyperlinkEvent.EventType.ACTIVATED) {
                                   SwingUtilities.invokeLater(new Runnable() {
                                        public void run() {
                                             //Save original
                                             Document doc = jt.getDocument();
                                             try {
                                                  URL url = e.getURL();
                                                  jt.setPage(url);
                                                  input.setText(url.toString());
                                             } catch (IOException io) {
                                                  JOptionPane.showMessageDialog(
                                                       Browser.this, "Can't follow link",
                                                       "Invalid Input",JOptionPane.ERROR_MESSAGE);
                                                  jt.setDocument(doc);
                         JScrollPane pane = new JScrollPane();
                         pane.setBorder(
                              BorderFactory.createLoweredBevelBorder());
                         pane.getViewport().add(jt);
                         p.add(pane, BorderLayout.CENTER);
                         input.addActionListener(new ActionListener() {
                              public void actionPerformed(ActionEvent e) {
                                   try {
                                        jt.setPage(input.getText());
                                   } catch (IOException ex) {
                                        JOptionPane.showMessageDialog(
                                             Browser.this,"Invalid URL","Invalid Input",JOptionPane.ERROR_MESSAGE);
                              p.add(input, BorderLayout.SOUTH);
                              JFrame f = new JFrame();
                              f.getContentPane().add(p);
                              //f.getContentPane().setSize(400,400);
                              f.setVisible(true);
                         public void actionPerformed(ActionEvent e) {}
                         public static void main(String[] args) {
                              Browser b = new Browser();
                              b.setSize(500,500);
                    }

Answer 1

i made a few changes and it works.
i have marked the changes.
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
import javax.swing.event.*;
import java.lang.*;
import javax.swing.text.*;
public class Browser extends JFrame implements ActionListener {     Browser() {
          JPanel p = new JPanel();
          p.setLayout(new BorderLayout(5,5));
          final JEditorPane jt = new JEditorPane();
          final JTextField input = new JTextField("http://java.sun.com");
          //make read only
          jt.setEditable(false);
          //follow links
          jt.addHyperlinkListener(new HyperlinkListener () {
                    public void hyperlinkUpdate(final HyperlinkEvent e) {
                         if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                              SwingUtilities.invokeLater(new Runnable() {
                                        public void run() {
                                             //Save original
                                             Document doc = jt.getDocument();
                                             try {
                                                  URL url = e.getURL();
                                                  jt.setPage(url);
                                                  input.setText(url.toString());
                                             catch (IOException io) {
                                                  JOptionPane.showMessageDialog
                                                       ( Browser.this, "Can't follow link",
                                                         "Invalid Input",JOptionPane.ERROR_MESSAGE);
                                                  jt.setDocument(doc);
          JScrollPane pane = new JScrollPane();
          pane.setBorder(BorderFactory.createLoweredBevelBorder());
          pane.getViewport().add(jt);
          p.add(pane, BorderLayout.CENTER);
          input.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                         try {
                              jt.setPage(input.getText());
                         } catch (IOException ex) {
                              JOptionPane.showMessageDialog
                                   ( Browser.this,"Invalid URL","Invalid Input",JOptionPane.ERROR_MESSAGE);
          p.add(input, BorderLayout.SOUTH);
          //JFrame f = new JFrame();          getContentPane().add(p);
          //f.getContentPane().setSize(400,400);
          setVisible(true);
          this.addWindowListener(new java.awt.event.WindowAdapter() {                    public void windowClosing(java.awt.event.WindowEvent e) {
                         System.exit(0);
     public void actionPerformed(ActionEvent e) {}
     public static void main(String[] args) {
          Browser b = new Browser();
          b.setSize(500,500);
}