code: public static File[] listFiles(final File aDir, final FilenameFilter aFilter) throws FileNotFoundException {
          return listFiles(aDir, aFilter, false, (String[]) null);
      }
docs: An array of all the files in the supplied directory that match the supplied <code>FilenameFilter</code>.
  
  @param aDir A directory from which a file listing should be returned
  @param aFilter A file name filter which returned files should match
  @return An array of matching files
  @throws FileNotFoundException If the supplied directory doesn't exist