Multiple FileFilter in a JFileChooser

Question

I wanna have a save file dialog with a list of choosableFileFilter that the user can select. Here is my code :
import java.io.File;
import javax.swing.filechooser.FileFilter;
public class ImageFilter extends FileFilter {
    private static String description;
    private static String extension;
    private static String loadOrSave;
    private final static String jpeg = "jpeg";
    private final static String jpg = "jpg";
    private final static String gif = "gif";
    private final static String tiff = "tiff";
    private final static String tif = "tif";
    private final static String png = "png";
    public ImageFilter(String ext,String desc,String type) {
        super();
        extension = ext;
        description = desc;
        loadOrSave = type;
    public boolean accept(File f) {
        if (loadOrSave.equals("load")) { // "load" ==> only accept files with the final extension above
            if (f.isDirectory()) {
                return true;
            String ext = getExtension(f);
            if (ext != null) {
                if (ext.equals(tiff) || ext.equals(tif) || ext.equals(gif) ||
                    ext.equals(jpeg) || ext.equals(jpg) || ext.equals(png)) {
                    return true;
                else return false;
            return false;
        else { // "save" ==> only accept files with extension "extension"
            if (f.isDirectory()) {
                return true;
            String ext = getExtension(f);
            if (ext != null) {
                if (ext.equals(extension)) return true;
                else return false;
            return false;
    // Get the extension of a file.
    public static String getExtension(File f) {
        String ext = null;
        String s = f.getName();
        int i = s.lastIndexOf('.');
        if (i > 0 &&  i < s.length() - 1) {
            ext = s.substring(i+1).toLowerCase();
        return ext;
    //The description of the Image filter
    public String getDescription() {
        if (loadOrSave.equals("load")) return "Images (*.jpg,*.jpeg,*.gif,*.png,*.tiff,*.tif)";
        else return description;
    public static String getSaveExtension() {
        if (loadOrSave.equals("save")) return extension;
        else return null;
}I then use my class in the following code fragment :
JFileChooser fc = new JFileChooser(currentdir);
        ImageFilter bmp = new ImageFilter("bmp","Images BMP (*.bmp)","save");
        ImageFilter jpeg = new ImageFilter("jpeg","Images JPEG (*.jpeg)","save");
        ImageFilter jpg = new ImageFilter("jpg","Images JPG (*.jpg)","save");
        ImageFilter png = new ImageFilter("png","Images PNG (*.png)","save");
        ImageFilter wbmp = new ImageFilter("wbmp","Images WBMP (*.wbmp)","save");
        fc.addChoosableFileFilter(bmp);
        fc.addChoosableFileFilter(jpeg);
        fc.addChoosableFileFilter(jpg);
        fc.addChoosableFileFilter(png);
        fc.addChoosableFileFilter(png);
        fc.setAcceptAllFileFilterUsed(false);
        int returnVal = fc.showSaveDialog(fc);The problem is that the choosable FileFilters in the save dialog have the same description : Images WBMP (*.wbmp). I don't understand why. I created different ImageFilters and then add them one by one. So where's the problem ?
Thx in advance.

Answer 1

Damned !
I'm always asking myself if I have to use the static modifier for a class variable.
I don't really understand the concept of static variables...
I think static variables belongs to the class and not to the instances of this class.. Am I right ?