What is the problem with this java code? I can see that there are no comments in it which makes it hard to understand. Is there anything else wrong with this code and is there a way to fix the formatting?

import java.awt.*; import java.awt.event.*; import java.util.*; import java.net.*; import java.io.*; import javax.swing.*; import javax.swing.event.*;

public class WebBrowser { public static void main(String [] args) { JFrame frame = new EditorPaneFrame(); frame.show(); } } class EditorPaneFrame extends JFrame {

private JTextField url; private JCheckBox editable; private JButton loadButton; private JButton backButton; private JEditorPane editorPane; private Stack urlStack = new Stack();

public EditorPaneFrame() { setTitle("Java Web Browser"); setSize(600,400); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } );

// set up text field and load button for typing in URL

url = new JTextField(30);

loadButton = new JButton("Load"); loadButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { try { // remember URL for back button urlStack.push(url.getText()); editorPane.setPage(url.getText()); } catch(Exception e) { editorPane.setText("Error: " +e); } } });

// set up back button and button action

backButton = new JButton("Back"); backButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if(urlStack.size()<=1) return; try { urlStack.pop(); String urlString = (String)urlStack.peek(); url.setText(urlString); editorPane.setPage(urlString); } catch(IOException e) { editorPane.setText("Error : " +e); } } });

editorPane = new JEditorPane(); editorPane.setEditable(false); editorPane.addHyperlinkListener(new HyperlinkListener() { public void hyperlinkUpdate(HyperlinkEvent event) { if(event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) { try { urlStack.push(event.getURL().toString()); url.setText(event.getURL().toString());

editorPane.setPage(event.getURL()); } catch(IOException e) { editorPane.setText("Error: " + e); } } } });

editable = new JCheckBox(); editable.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { editorPane.setEditable(editable.isSelected()); } });

Container contentPane = getContentPane(); contentPane.add(new JScrollPane(editorPane), "Center");

JPanel panel = new JPanel(); panel.add(new JLabel("URL")); panel.add(url); panel.add(loadButton); panel.add(backButton); panel.add(new JLabel("Editable")); panel.add(editable);

contentPane.add(panel,"South"); }

}