Java Open Dialogbox

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

    public class FileChooserDemo extends JFrame {
     static private final String newline = "\n";
   
         public FileChooserDemo() {
         super("FileChooserDemo");
       
         //Create the log first, because the action listeners
         //need to refer to it.
         final JTextArea log = new JTextArea(5,20);
         log.setMargin(new Insets(5,5,5,5));
         log.setEditable(false);
         JScrollPane logScrollPane = new JScrollPane(log);
       
         //Create a file chooser
         final JFileChooser fc = new JFileChooser();
       
         //Create the open button
         ImageIcon openIcon = new ImageIcon("images/open.gif");
         JButton openButton = new JButton("Open a File...", openIcon);
             openButton.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                 int returnVal = fc.showOpenDialog(FileChooserDemo.this);
               
                     if (returnVal == JFileChooser.APPROVE_OPTION) {
                     File file = fc.getSelectedFile();
                     //this is where a real application would open the file.
                     log.append("Opening: " + file.getName() + "." + newline);
                     } else {
                     log.append("Open command cancelled by user." + newline);
                 }
             }
         });
       
         //Create the save button
         ImageIcon saveIcon = new ImageIcon("save.gif");
         JButton saveButton = new JButton("Save a File...", saveIcon);
             saveButton.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                 int returnVal = fc.showSaveDialog(FileChooserDemo.this);
               
                     if (returnVal == JFileChooser.APPROVE_OPTION) {
                     File file = fc.getSelectedFile();
                     //this is where a real application would save the file.
                     log.append("Saving: " + file.getName() + "." + newline);
                     } else {
                     log.append("Save cancelled by user." + newline);
                 }
             }
         });
       
         JPanel buttonPanel = new JPanel();
         buttonPanel.add(openButton);
         buttonPanel.add(saveButton);
         openButton.setNextFocusableComponent(saveButton);
         saveButton.setNextFocusableComponent(openButton);
         Container contentPane = getContentPane();
         contentPane.add(buttonPanel, BorderLayout.NORTH);
         contentPane.add(logScrollPane, BorderLayout.CENTER);
     }
   
         public static void main(String[] args) {
         JFrame frame = new FileChooserDemo();
       
             frame.addWindowListener(new WindowAdapter() {
                 public void windowClosing(WindowEvent e) {
                 System.exit(0);
             }
         });
       
         frame.pack();
         frame.setVisible(true);
     }
}