import java.io.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.filechooser.*;/* * FileChooserDemo.java is a 1.4 application that uses these files: *   images/Open16.gif *   images/Save16.gif */public class FileChooserDemo extends JPanel                             implements ActionListener {    static private final String newline = "\n";    JButton openButton, saveButton;    JTextArea log;    JFileChooser fc;    public FileChooserDemo() {        super(new BorderLayout());        //Create the log first, because the action listeners        //need to refer to it.        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        fc = new JFileChooser();        //Uncomment one of the following lines to try a different        //file selection mode.  The first allows just directories        //to be selected (and, at least in the Java look and feel,        //shown).  The second allows both files and directories        //to be selected.  If you leave these lines commented out,        //then the default mode (FILES_ONLY) will be used.        //        //fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);        //fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);        //Create the open button.  We use the image from the JLF        //Graphics Repository (but we extracted it from the jar).        openButton = new JButton("Open a File...",                                 createImageIcon("images/Open16.gif"));        openButton.addActionListener(this);        //Create the save button.  We use the image from the JLF        //Graphics Repository (but we extracted it from the jar).        saveButton = new JButton("Save a File...",                                 createImageIcon("images/Save16.gif"));        saveButton.addActionListener(this);        //For layout purposes, put the buttons in a separate panel        JPanel buttonPanel = new JPanel(); //use FlowLayout        buttonPanel.add(openButton);        buttonPanel.add(saveButton);        //Add the buttons and the log to this panel.        add(buttonPanel, BorderLayout.PAGE_START);        add(logScrollPane, BorderLayout.CENTER);    }    public void actionPerformed(ActionEvent e) {        //Handle open button action.        if (e.getSource() == openButton) {            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);            }            log.setCaretPosition(log.getDocument().getLength());        //Handle save button action.        } else if (e.getSource() == saveButton) {            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 command cancelled by user." + newline);            }            log.setCaretPosition(log.getDocument().getLength());        }    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = FileChooserDemo.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        JDialog.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("FileChooserDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        JComponent newContentPane = new FileChooserDemo();        newContentPane.setOpaque(true); //content panes must be opaque        frame.setContentPane(newContentPane);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}