A very simple and crude web browser written in Java

WebBrowser.java

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.IDN;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
 
public class WebBrowser extends JFrame implements HyperlinkListener {   
     private JTextField txtURL= new JTextField("");   
     JEditorPane ep = new JEditorPane();   
     private JLabel lblStatus= new JLabel(" ");    
 
public WebBrowser() {         
     setDefaultCloseOperation(EXIT_ON_CLOSE);     
     JPanel pnlURL = new JPanel();     
     pnlURL.setLayout(new BorderLayout());     
     pnlURL.add(new JLabel("URL: "), BorderLayout.WEST);     
     pnlURL.add(txtURL, BorderLayout.CENTER);     
     getContentPane().add(pnlURL, BorderLayout.NORTH);     
     getContentPane().add( ep, BorderLayout.CENTER);      
     getContentPane().add(lblStatus, BorderLayout.SOUTH);      
     ActionListener al = new ActionListener() {       
          public void actionPerformed(ActionEvent ae) {         
               try {           
                    String url = ae.getActionCommand().toLowerCase();           
                    if (url.startsWith("http://"))             
                         url = url.substring(7);           
                    ep.setPage("http://" + IDN.toASCII(url));         
               } catch (Exception e) {           
                    e.printStackTrace();
                    JOptionPane.showMessageDialog(WebBrowser.this, "Browser problem: " + e.getMessage());         
               }       
          }     
     };     
 
     txtURL.addActionListener(al);      
     setSize(300, 300);     
     setVisible(true);   
}   
 
public void hyperlinkUpdate(HyperlinkEvent hle) {          
     HyperlinkEvent.EventType evtype = hle.getEventType();     
     if (evtype == HyperlinkEvent.EventType.ENTERED)                 
          lblStatus.setText(hle.getURL().toString());     
     else if (evtype == HyperlinkEvent.EventType.EXITED)                
          lblStatus.setText(" ");   
     }    
 
public static void main(String[] args) {     
     new WebBrowser();  
     } 
}