import java.util.UUID; public class RandomUUIDGenerator { public static void main(String[] args) { // Generate a random UUID UUID randomUUID = UUID.randomUUID(); // Convert UUID to String String uuidString = randomUUID.toString(); // Print the generated UUID System.out.println("Random UUID: " + uuidString); } }public static void main(String[] args) { final String uuid = UUID.randomUUID().toString().replace("-", ""); System.out.println("uuid = " + uuid); } import java.security.SecureRandom; import java.util.UUID; public class RandomUtil { // Maxim: Copied from UUID implementation :) private static volatile SecureRandom numberGenerator = null; private static final long MSB = 0x8000000000000000L; public static String unique() { SecureRandom ng = numberGenerator; if (ng == null) { numberGenerator = ng = new SecureRandom(); } return Long.toHexString(MSB | ng.nextLong()) + Long.toHexString(MSB | ng.nextLong()); } }