see what it takes to make one of these filters work : File Chooser « Swing JFC « Java

see what it takes to make one of these filters work

see what it takes to make one of these filters work
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
//Just a simple example to see what it takes to make one of these filters work.

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.filechooser.FileFilter;

public class MyFilterChooser extends JFrame {
  public MyFilterChooser() {
    super("Filter Test Frame");
    setSize(350, 200);

    Container c = getContentPane();
    c.setLayout(new FlowLayout());

    JButton openButton = new JButton("Open");
    final JLabel statusbar = new JLabel(
        "Output of your selection will go here");

    openButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        String[] pics = new String[] { "gif", "jpg", "tif" };
        String[] audios = new String[] { "au", "aiff", "wav" };
        JFileChooser chooser = new JFileChooser();
        chooser.addChoosableFileFilter(new SimpleFileFilter(pics,
            "Images (*.gif, *.jpg, *.tif)"));
        chooser.addChoosableFileFilter(new SimpleFileFilter(".MOV"));
        chooser.addChoosableFileFilter(new SimpleFileFilter(audios,
            "Sounds (*.aiff, *.au, *.wav)"));
        int option = chooser.showOpenDialog(MyFilterChooser.this);
        if (option == JFileChooser.APPROVE_OPTION) {
          if (chooser.getSelectedFile() != null)
            statusbar.setText("You chose "
                + chooser.getSelectedFile().getName());
        } else {
          statusbar.setText("You canceled.");


  public static void main(String args[]) {
    MyFilterChooser mfc = new MyFilterChooser();

//A straightforward extension-based example of a file filter. This should be
//replaced by a "first class" Swing class in a later release of Swing.

class SimpleFileFilter extends FileFilter {

  String[] extensions;

  String description;

  public SimpleFileFilter(String ext) {
    this(new String[] { ext }, null);

  public SimpleFileFilter(String[] exts, String descr) {
    // Clone and lowercase the extensions
    extensions = new String[exts.length];
    for (int i = exts.length - 1; i >= 0; i--) {
      extensions[i] = exts[i].toLowerCase();
    // Make sure we have a valid (if simplistic) description
    description = (descr == null ? exts[0] + " files" : descr);

  public boolean accept(File f) {
    // We always allow directories, regardless of their extension
    if (f.isDirectory()) {
      return true;

    // Ok, it's a regular file, so check the extension
    String name = f.getName().toLowerCase();
    for (int i = extensions.length - 1; i >= 0; i--) {
      if (name.endsWith(extensions[i])) {
        return true;
    return false;

  public String getDescription() {
    return description;


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