code: public final Collection<File> findFiles(File directory, FileFilter filter) {
  		final Collection<File> files = new ArrayList<>();
  		findFiles(directory, filter, files);
  		return files;
  	}
docs: Replies a list of files which are found on the file system.
  
  @param directory
  is the directory to search in.
  @param filter
  is the file selector
  @return the list of files.