else return "";
return "";
    public final String getPassword(final String base)    throws IllegalArgumentException {        // Sanity check.        if ((base == null) || (base.length() == 0))            throw new IllegalArgumentException("Base must be a non-empty string");        // Return the username, or an empty string if the base was not        // recognized.        if (passwords.containsKey(base))            return (String) passwords.get(base);        else            return "";    }