import java.util.*; 
  import java.net.*; 
  import java.io.*; 
  import javax.swing.*; 
   
  public class WebBrowserPane extends JEditorPane 
  { 
  	private List history=new ArrayList(); 
  	private int historyIndex; 
   
  	public WebBrowserPane() 
  	{ 
  		setEditable(false); 
  	} 
   
  	public void goToURL(URL url) 
  	{ 
  		displayPage(url); 
  		history.add(url); 
  		historyIndex=history.size()-1; 
  	} 
   
  	public URL forward() 
  	{ 
  		historyIndex++; 
  		if (historyIndex>=history.size()) 
  			historyIndex=history.size()-1; 
  		URL url=(URL) history.get(historyIndex); 
  		displayPage(url); 
  		return url; 
  	} 
   
  	public URL back() 
  	{ 
  		historyIndex--; 
  		if (historyIndex<0) 
  			historyIndex=0; 
  		URL url=(URL) history.get(historyIndex); 
  		displayPage(url); 
  		return url; 
  	} 
   
  	private void displayPage(URL pageURL) 
  	{ 
  		try { 
  			setPage(pageURL); 
  		} catch (IOException ioException) { 
  			ioException.printStackTrace(); 
  		} 
  	} 
  } 
   
  

 
  import java.awt.*; 
  import java.awt.event.*; 
  import java.net.*; 
  import javax.swing.*; 
  import javax.swing.event.*; 
   
  public class WebToolBar extends JToolBar implements HyperlinkListener 
  { 
  	private WebBrowserPane webBrowserPane; 
  	private JButton backButton; 
  	private JButton forwardButton; 
  	private JTextField urlTextField; 
   
  	public WebToolBar(WebBrowserPane browser) 
  	{ 
  		super("Web Navigation"); 
  		webBrowserPane=browser; 
  		webBrowserPane.addHyperlinkListener(this); 
  		urlTextField=new JTextField(25); 
  		urlTextField.addActionListener( 
  			new ActionListener() { 
  				public void actionPerformed(ActionEvent event) 
  				{ 
  					try { 
  						URL url=new URL(urlTextField.getText()); 
  						webBrowserPane.goToURL(url); 
  					} catch (MalformedURLException urlException) { 
  						urlException.printStackTrace(); 
  					} 
  				} 
  			} 
  		); 
  		backButton=new JButton("Go Back"); 
  		backButton.addActionListener( 
  			new ActionListener() { 
  				public void actionPerformed(ActionEvent event) 
  				{ 
  					URL url=webBrowserPane.back(); 
  					urlTextField.setText(url.toString()); 
  				} 
  			} 
  		); 
  		forwardButton=new JButton("Go Forward"); 
  		forwardButton.addActionListener( 
  			new ActionListener() { 
  				public void actionPerformed(ActionEvent event) 
  				{ 
  					URL url=webBrowserPane.forward(); 
  					urlTextField.setText(url.toString()); 
  				} 
  			} 
  		); 
  		add(backButton); 
  		add(forwardButton); 
  		add(urlTextField); 
  	} 
   
  	public void hyperlinkUpdate(HyperlinkEvent event) 
  	{ 
  		if (event.getEventType()==HyperlinkEvent.EventType.ACTIVATED) { 
  			URL url=event.getURL(); 
  			webBrowserPane.goToURL(url); 
  			urlTextField.setText(url.toString()); 
  		} 
  	} 
  } 
  

 
  import java.awt.*; 
  import java.awt.event.*; 
  import java.net.*; 
  import javax.swing.*; 
  import javax.swing.event.*; 
   
  public class WebBrowser extends JFrame 
  { 
  	private WebToolBar toolBar; 
  	private WebBrowserPane browserPane; 
   
  	public WebBrowser() 
  	{ 
  		super("Zed Web Browser"); 
  		browserPane=new WebBrowserPane(); 
  		toolBar=new WebToolBar(browserPane); 
  		Container contentPane=getContentPane(); 
  		contentPane.add(toolBar,BorderLayout.NORTH); 
  		contentPane.add(new JScrollPane(browserPane),BorderLayout.CENTER); 
  	} 
  	 
  	public static void main(String[] args) 
  	{ 
  		WebBrowser browser=new WebBrowser(); 
  		browser.setDefaultCloseOperation(EXIT_ON_CLOSE); 
  		browser.setSize(640,480); 
  		browser.setVisible(true); 
  	} 
  }