Tuesday, August 7, 2007

Java 101: Generate a unique identifier with java.util.UUID

A friend of mine was asking me how to generate a unique ID for his application... As you probably already know Java SE 5 has introduced the java.util.UUID class to easily generate Universally Unique Identifier (UUID). As usual Wikipedia is a great starting point to learn more about UUID.
Generating the unique ID is as simple as calling the method UUID.randomUUID() in the class. This will give a new instance of UUID that you can now manipulate; for example do a toString() to get the UUID string representation as describe in the specifications; for example 5462dc18-4653-42d1-b4e4-22fc970a6ce5



Laurent Schneider said...

nice to know, a clever alternative to oracle sequences

Pavel said...

Nice article! Exactly what I was looking for.

pringi said...


Anonymous said...

Will it generate unique identifier after restarting application