Ayuda con filtro para filechooser

[ideafix]

ya hice eso que me comentas y no me funciona:

public class ImageFilter extends FileFilter {

//Accept all directories and all gif, jpg, tiff, or png files.
public boolean accept(File f) {
if (f.isDirectory()) {
return true;
}

String extension = Utils.getExtension(f);
if (extension != null ) {
if (extension.equals(Utils.tiff) ||
extension.equals(Utils.tif) ||
extension.equals(Utils.gif) ||
extension.equals(Utils.jpeg) ||
extension.equals(Utils.jpg) ||
extension.equals(Utils.png)) {
return true ;
} else {
return false ;
}
}

return false;
}

//The description of this filter
public String getDescription() {
return "Just Images";
}
}