Error in JavaExamples book ??

[Hussein Baghdadi]

Hi all.
I am trying some examples from JavaExamples book.
there is an example that creates a simple web browser, some of the code :

  
   private boolean visit(URL url) {
        try {
            String href = url.toString();
            this.startAnimation("Loading " + href + "...");
            editorPane.setPage(url);
            urlField.setText(href);
            return true;
        } catch (IOException e) {
            this.stopAnimation();
            msgLine.setText("Can't load page: " + e.toString());
            return false;
        }
    }
    private void displayPage(String href) {
        try {
            this.displayPage(new URL(href));
        } catch (MalformedURLException e) {
            msgLine.setText("Bad URL: " + href);
        }
    }
    private void openPage() {
        if (fileChooser == null) {
            fileChooser = new JFileChooser();
            fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
            FileFilter filter = new FileFilter() {
                public boolean accept(File f) {
                    if (f.isDirectory())
                        return true;
                    else {
                        String fn = f.getName();
                        if (fn.endsWith(".html") || fn.endsWith(".htm"))
                            return true;
                        else
                            return false;
                    }
                }
 
                public String getDescription() {
                    return "HTML Files";
                }
            };
            fileChooser.setFileFilter(filter);
            fileChooser.addChoosableFileFilter(filter);
        }
        int result = fileChooser.showOpenDialog(this);
        if (result == JFileChooser.APPROVE_OPTION) {
            File selectedFile = fileChooser.getSelectedFile();
            String url = "file://" + selectedFile.getAbsolutePath();
            System.out.println(url);
            this.displayPage(url);
        }
    }

when trying to display a page in f:\html dir, I got the following exception :
java.net.UnknownHostException F
any ideas ??
thanks..