import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class BrowserAdvanced extends JFrame {

   private JTextField tf = new JTextField("https://people.dsv.su.se/~pierre/i/i.cgi?href=aa_public/home/main.txt");
   private JEditorPane ep = new JEditorPane();

   public static void main(String[] args) {
      new BrowserAdvanced();
   }

   public BrowserAdvanced() {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      tf.setColumns(40);
      tf.addActionListener(new L1());
      JPanel p = new JPanel();     
      p.setLayout(new FlowLayout());
      p.add(tf);

      getContentPane().add("North", p);
      getContentPane().add("Center", new JScrollPane(ep));
      ep.addHyperlinkListener(new L2());
      ep.setEditable(false);

      setSize(640, 400);
      setVisible(true);
      getPageFromNet();
   }

   private void getPageFromNet() {
      try {
         ep.setPage(tf.getText());
      } catch(Exception e) {
         ep.setText("Error: " + e);
         System.out.println(e.toString());
      }
      Toolkit.getDefaultToolkit().beep();
   }
   
   class L1 implements ActionListener {
      public void actionPerformed(ActionEvent ae) {
         getPageFromNet();
      }
   }

   class L2 implements HyperlinkListener {
      public void hyperlinkUpdate(HyperlinkEvent he) {
         if(he.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
            try {
               tf.setText(he.getURL().toString());
               ep.setPage(he.getURL());
            } catch(Exception e) {
               ep.setText("Error: " + e);
               System.out.println(e.toString());
            }
            Toolkit.getDefaultToolkit().beep();
         }
      }
   }
}