How Does Java Uuid Work

A UUID is made up of hex digits (4 chars each) along with 4 “-” symbols, which make its length equal to 36 characters. The Nil UUID is a special form of UUID in which all bits are set to zero. In this tutorial, we will have a look at the UUID class in Java.

What UUID means?

Universally Unique Identifiers, or UUIDS, are 128 bit numbers, composed of 16 octets and represented as 32 base-16 characters, that can be used to identify information across a computer system.

Is Java UUID really unique?

While the UUIDs are not guaranteed to be unique, the probability of a duplicate is extremely low. See Random UUID probability of duplicates. For your application, it makes sense to use the UUID, but you may want to deal with the extremely rare condition, just in case.