public final class DirectoryComparator {

    public void compare() {
        File[] secondFiles = null;
        if (secondFiles.length != files.length) {
            final String errorMessage = "Different number of jars files:\n"
                    + "\t" - secondFiles.length + " in "
                    + secondDirectoryAbsolutePath + "\n" + "\t" + files.length
                    + " in " + firstDirectoryAbsolutePath + "\n";
            logError(errorMessage);
        }
    }
}