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  1. import java.util.Scanner;
  2. import java.util.UUID;
  3. import java.nio.ByteBuffer;
  4.  
  5. public class Main {
  6.     public static void main(String[] args) {
  7.         Scanner scanner = new Scanner(System.in);
  8.         System.out.println("Enter UUID:");
  9.         String input = scanner.nextLine();
  10.  
  11.         try {
  12.             UUID uuid = UUID.fromString(input);
  13.             ByteBuffer buffer = ByteBuffer.allocate(16);
  14.             buffer.putLong(uuid.getMostSignificantBits());
  15.             buffer.putLong(uuid.getLeastSignificantBits());
  16.             byte[] bytes = buffer.array();
  17.  
  18.             System.out.println("Byte array in hex:");
  19.             for (byte b : bytes) {
  20.                 System.out.printf("%02X ", b);
  21.             }
  22.         } catch (IllegalArgumentException e) {
  23.             System.out.println("Invalid UUID format.");
  24.         }
  25.     }
  26. }
  27.  
Success #stdin #stdout 0.15s 56708KB
comments (?)
stdin 
01020304-1011-2021-3031-414243444346
stdout 
Enter UUID:
Byte array in hex:
01 02 03 04 10 11 20 21 30 31 41 42 43 44 43 46
https://ideone.com/baTpKa
language:
Java (HotSpot 12)
created:
145 days ago
visibility:
secret

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