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 
*/
// MyFilterChooser.java
//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 java.io.File;

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);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    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.");
        }
      }
    });

    c.add(openButton);
    c.add(statusbar);
    setVisible(true);
  }

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

//SimpleFileFilter.java
//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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1.	JFileChooser is a standard dialog for selecting a file from the file system.
2.	A demo which makes extensive use of the file chooser
3.	Demonstration of File dialog boxes
4.	JFileChooser class in action with an accessory
5.	A simple file chooser to see what it takes to make one of these work
6.	show thumbnails of graphic files
7.	FileChooser file filter customized filechooser
8.	Choose a File
9.	Customizing a JFileChooser
10.	A simple FileFilter class that works by filename extension
11.	Swing File Chooser Demo
12.	FileChooser Demo
13.	File Chooser Demo 2
14.	File Chooser Demo 4
15.	Getting the File-Type Icon of a File
16.	Getting the Large File-Type Icon of a File
17.	Listening for Approve and Cancel Events in a JFileChooser Dialog
18.	String javax.swing.JFileChooser.APPROVE_SELECTION
19.	void javax.swing.JFileChooser.addActionListener(ActionListener l)
20.	JDialog javax.swing.JFileChooser.createDialog(Component parent)
21.	void javax.swing.JFileChooser.setDialogType(int dialogType)
22.	Changing the Text of the Approve Button in a JFileChooser Dialog
23.	Determining If a File Is Hidden
24.	Showing Hidden Files in a JFileChooser Dialog
25.	Enabling Multiple Selections in a JFileChooser Dialog
26.	Listening for Changes to the Selected File in a JFileChooser Dialog
27.	Getting the File-Type Name of a File
28.	Getting and Setting the Selected File of a JFileChooser Dialog
29.	Getting and Setting the Current Directory of a JFileChooser Dialog
30.	Determining If the Approve or Cancel Button Was Clicked in a JFileChooser Dialog
31.	Adding a Filter to a File Chooser Dialog
32.	Displaying Only Directories in a File Chooser Dialog
33.	Creating a JFileChooser Dialog
34.	Localize a JFileChooser
35.	Select a directory with a JFileChooser
36.	Disable the JFileChooser's "New folder" button
37.	Validate a filename from a JFileChooser
38.	extends FileView to create custom File chooser
39.	Suffix FileFilter
40.	Extension File Filter
41.	Files filter that filters files by their suffix (or extension)
42.	Generic File Filter
43.	Get Directory Choice
44.	Get File Choice
45.	A file view that displays an icon for all files that match a file filter
46.	Dir File Filter extends javax.swing.filechooser.FileFilter

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

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