getting the list of files of a folder

/**
     * returns the list of files of a given directory
     *
     * @param listOfFiles
     */
    public static void getListOfFilesOfFolder(File directory,
            List<File> listOfFiles) {
        
        File[] fileList = directory.listFiles(FileFilter.getInstance());
        for (int iFile = 0; iFile < fileList.length; iFile++) {
            File oneFile = fileList[iFile];
            if (!oneFile.isDirectory()) {
                listOfFiles.add(fileList[iFile]);
            } else {
                getListOfFilesOfFolder(oneFile, listOfFiles);
            }
        }
    }

//the FileFilter class is a class that implements the interface FileNameFilter