How To Create a UUID in Java?

In this article, you will see how to create a UUID in Java.

Introduction

A UUID, or a universally unique identifier, is a 128-bit number used to identify information in computer systems.

UUID is made of hex digits along with 4 hyphens (-). The length of a UUID is 36 characters.

There are 5 types of UUID, but mostly version 4, i.e., Randomly Generated UUID, is used.

We are going to create the version 4 UUID here.

If you do not want to read, you can watch the short video on How to create UUID in Java?

Example UUID

`df6fdea1-10c3-474c-ae62-e63def80de0b`

How to create UUID in Java?

Creating a Randomly Generated UUID (version 4) is really easy in Java.

UUID class is present in thejava.utilpackage. And it has the static methodrandomUUID()which returns the randomly generated UUID.

The example is given below:

import java.util.UUID;

/**

 * A Java program to create a Randomly Generated UUID i.e. Version 4 UUID

 * @author Gaurav Kukade at coderolls.com

 *

 */

public class CreateUUID {

    public static void main(String[] args) {

        // creating random uuid i.e. version 4 UUID

        UUID uuid = UUID.randomUUID();

        System.out.println("Printing the randomly generated UUID value......\n");

        System.out.println("uuid: "+uuid);

    }

}

Output: 

xxxxxxxxxx

Printing the randomly generated UUID value......

uuid: e3aed661-ccc2-42fd-ad69-734fee350cd2

Get the above code as GitHub Gist.

This article was originally published at coderolls.com/create-uuid-in-java