longArrayToString.java

private static String longArrayToString(long[] values) {
    StringBuffer sb = new StringBuffer();
    if (values != null) {
        for (int i = 0; i < values.length - 1; i++) {
            sb.append(values[i]).append(DELIMITER);
        }
        sb.append(values[values.length - 1]);
    }
    return sb.toString();
}