Swing applet- please help

Question

Hi,
I am still trying to make sense of the java code...
I thought it should be easy to create an applet, but I don't know what is wrong.
Could anyone help me debugging it?
Here is the code and the error msg:
package BrImage;
/* Example 16-3 An Image Previewer Accessory implements BrImagFile*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
import java.applet.Applet;
public class BrImage extends JApplet {
public void init() {
getContentPane().add(new JLabel("JAppletSwing!"));
public class BrImagFile extends javax.swing.JFrame {
JFileChooser chooser = new JFileChooser();
ImagePreviewer previewer = new ImagePreviewer();
PreviewPanel previewPanel = new PreviewPanel();
class PreviewPanel extends javax.swing.JPanel {
public PreviewPanel() {
JLabel label = new JLabel("Image Previewer",SwingConstants.CENTER);
setPreferredSize(new Dimension(150,0));
setBorder(BorderFactory.createEtchedBorder());
setLayout(new BorderLayout());
label.setBorder(BorderFactory.createEtchedBorder());
add(label, BorderLayout.NORTH);
add(previewer, BorderLayout.CENTER);
public BrImagFile() {
super("Image Previewer");
Container contentPane = getContentPane();
JButton button = new JButton("Select A File");
contentPane.setLayout(new FlowLayout());
contentPane.add(button);
chooser.setAccessory(previewPanel);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int state = chooser.showOpenDialog(null);
File file = chooser.getSelectedFile();
String s = "CANCELED";
if(file != null && state == JFileChooser.APPROVE_OPTION) {
s = "File Selected: " + file.getPath();
/* needs to open file on the right html */
JOptionPane.showMessageDialog(null, s);
chooser.setFileFilter(new ImageFilter()); /*test filter */
chooser.addPropertyChangeListener(
new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent e) {
if(e.getPropertyName().equals(
JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
File f = (File)e.getNewValue();
String s = f.getPath(), suffix = null;
int i = s.lastIndexOf('.');
if(i > 0 && i < s.length() - 1)
suffix = s.substring(i+1).toLowerCase();
if(suffix.equals("gif") ||
suffix.equals("jpg") ||
suffix.equals("bmp"))
previewer.configure(f);
class ImagePreviewer extends javax.swing.JLabel {
public void configure(File f) {
Dimension size = getSize();
Insets insets = getInsets();
ImageIcon icon = new ImageIcon(f.getPath());
setIcon(new ImageIcon(icon.getImage().getScaledInstance(
size.width - insets.left - insets.right,
size.height - insets.top - insets.bottom,
Image.SCALE_SMOOTH)));
class ImageFilter extends javax.swing.filechooser.FileFilter {
public boolean accept(File f) {
boolean accept = f.isDirectory();
if( ! accept) {
String suffix = getSuffix(f);
if(suffix != null)
accept = suffix.equals("jpg") ||
suffix.equals("gif") ||
suffix.equals("bmp");
return accept;
public String getDescription() {
return "Image Files(*.gif *.jpg *.bmp)";
private String getSuffix(File f) {
String s = f.getPath(), suffix = null;
int i = s.lastIndexOf('.');
if(i > 0 && i < s.length() - 1)
suffix = s.substring(i+1).toLowerCase();
return suffix;
public static void main(String a[]) {
JApplet applet = new BrImage();
JFrame f = new BrImagFile();
f.setBounds(300, 300, 300, 75);
applet.init();
applet.start();
f.setVisible(true);
/* f.setDefaultCloseOperation(
WindowConstants.DISPOSE_ON_CLOSE); */
f.addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
System.exit(0);
BrImage/BrImage.java [109:1] non-static variable this cannot be referenced from a static context
JFrame f = new BrImagFile();
^
1 error
Errors compiling BrImage.

Answer 1

Hi again,
Please help.
JL