/**
 * Returns a list of files that the extension name matchs one of extensions.
 * 
 * Usage: getFilesByNameExtensions(dir, "txt", "JPEG");
 * @author greatghoul http://www.g2w.me
 * @param dir The directory to scan in.
 * @param extensions Extensions collection.
 * @return A list of matched files.
 */
public static List getFilesByNameExtensions(File dir, final String... extensions) {
    return Arrays.asList(dir.listFiles(new FilenameFilter()  {
        @Override
        public boolean accept(File dir, String name) {
            File file = new File(dir, name);
            boolean accept = false;
            for (String extension : extensions) {
                if (file.isDirectory()) break;
                if (name.toLowerCase().endsWith("." + extension.toLowerCase())) {
                    accept = true;
                    break;
                }
            }
            return accept;
        }    
    }));
}