How To Generate UUID In Java
In this example we are generating UUID using java API. We can use this java API if your JDK is above 1.5.
Following are the important methods avaialbe on UUID class
Reference -> http://docs.oracle.com/javase/6/docs/api/java/util/UUID.html
Usage of java.util.UUID class
This class is used to generate random UUID (Universally unique identifier).
It is first introduced with JDK 1.5, method randomUUID() will return a UUID object, we need to convert this UUID object to string in order to use this.
Code to Generate UUID In Java
package com.test;
import java.util.UUID;
public class GenerateJavaUUIDExample {
/**
* How To Generate UUID (Universally unique identifier) In Java
*/
public static void main(String[] args) {
UUID first = UUID.randomUUID();
UUID second = UUID.randomUUID();
System.out.println("UUID first: " + first);
System.out.println("UUID second: " + second);
System.out.println("UUID version: " + second.version());
System.out.println("UUID variant: " + second.variant());
}
}
import java.util.UUID;
public class GenerateJavaUUIDExample {
/**
* How To Generate UUID (Universally unique identifier) In Java
*/
public static void main(String[] args) {
UUID first = UUID.randomUUID();
UUID second = UUID.randomUUID();
System.out.println("UUID first: " + first);
System.out.println("UUID second: " + second);
System.out.println("UUID version: " + second.version());
System.out.println("UUID variant: " + second.variant());
}
}
Output
UUID first: 6a2871ee-3cba-4074-9fa4-68d2a8312291 UUID second: 5f8b876c-87b4-4f83-8fea-f9a761552ed4 UUID version: 4 UUID variant: 2