Java DCE UUID

I am searching for the Java Distributed Computing Environment (DCE) universally unique identifier (UUID)? If anyone has some idea regarding this term then please provide me completed information of Java Distributed Computing Environment (DCE) universally unique identifier (UUID)?

I am doing my MCA final year degree from Annamalai University and searching for some details about Java Topics. Will you provide basic details about Java DCE Java UUID (Universally Unique Identifier) class also provide details about Java UUID Constructor?

[pawan]

Java UUID (Universally Unique Identifier) class is part of java.util package.

Java UUID class represents an immutable universally unique identifier and represents 128-bit value. It is also known as GUID (Globally Unique Identifier)

Java UUID Usage


Java UUID is used to create following:

Random File Name
Session Id for Java Web Application
Primary Key for Database Table
Transaction Id

Java UUID Constructor


public UUID(long mostSigBits, long leastSigBits)
Creates a new UUID using specified data.

UUID variants:


0 Reserved for NCS backward compatibility
2 Leach-Salz
6 Reserved, Microsoft Corporation backward compatibility
7 Reserved for future definition

UUID Versions:


time-based(version 1)
DCE Security(version 2)
name-based(version 3)
randomly generated UUID(version 4)