Preliminary understanding of UUID

Import Java.util.UUID;
/**
 * UUID is a universal unique identifier, which is a standard * uuid for software construction
 is a very good choice for database table primary key, ensuring that each generated UUID is the only
 * 
 *uuid Composition: The current date and time; the clock sequence; Globally unique IEEE machine identification number;
 * Standard UUID format is: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (8-4-4-4-12)
 *
 *java UUID generator:
 * Java uuid Generator (JUG): Open source UUID Generator, LGPL protocol, support MAC address.
 *uuid: Special License, has the source code.
 *java 5 version of the UUID generator: it seems that only the UUID of version 3/4 can be generated.
 * In addition, there is also a UUID generator in hibernate, but the generated is not any (canonical) version of the UUID and is strongly not recommended for use.
 *
/public class Test1 {public
    static void Main (string[] args) {while
        (true) {
            System.out.println (Uuid.randomuuid ());}}