Java Utililty Methods UUID Create

UUID uuid = UUID.randomUUID();
StringBuffer idcUuid = new StringBuffer(uuid.toString().toUpperCase());
while (idcUuid.length() < 36) {
    idcUuid.append("0");
return idcUuid.toString();

UUID result = UUID.randomUUID();
char[] chars = result.toString().toCharArray();
if (chars[0] >= 'a' && chars[0] <= 'z') {
    return result;
} else {
    Random r = new Random();
    chars[0] = hexa.charAt(r.nextInt(hexan));
    result = UUID.fromString(new String(chars));
...

char[] uuid = new char[32];
char[] chars = UUID.randomUUID().toString().toCharArray();
for (int i = 0, j = 0; i < 32; j++)
    if (chars[j] != '-')
        uuid[i++] = chars[j];
return new String(uuid);

String random = UUID.randomUUID().toString();
random = random.replace("/", "_");
random = random.replace("=", "a");
random = random.replace("+", "f");
return random;

StringBuffer sb = new StringBuffer();
for (int i = 0; i < 8; i++) {
    sb.append(UUID.randomUUID().toString().split("-")[0]);
    sb.append(UUID.randomUUID().toString().split("-")[1]);
    sb.append(UUID.randomUUID().toString().split("-")[2]);
    sb.append(UUID.randomUUID().toString().split("-")[3]);
    sb.append(UUID.randomUUID().toString().split("-")[4]);
return sb.toString();

String uuid_prefix = "4a682b0b-0361-dbae-6155";
String uuid = String.valueOf(UUID.randomUUID());
String uuid_suffix = uuid.substring(uuid.lastIndexOf("-"));
return uuid_prefix + uuid_suffix;

UUID uuid = UUID.randomUUID();
return uuid.toString();

String uuid = UUID.randomUUID().toString();
if (dash) {
    return uuid;
return uuid.replaceAll("-", "");

Random r = new Random();
StringBuilder sb = new StringBuilder(numchars);
for (int i = 0; i < numchars; i++) {
    int c = r.nextInt(36) + 97;
    if (c > 'z')
        c -= ('z' - '0' + 1);
    sb.append((char) c);
return sb.toString();

StringBuffer tmpBuffer = new StringBuffer(16);
if (hexServerIP_ == null) {
    InetAddress localInetAddress = null;
    try {
        localInetAddress = InetAddress.getLocalHost();
    } catch (java.net.UnknownHostException uhe) {
        uhe.printStackTrace();
        return null;
...