How long is java uuid

Show 5 more comments. Active Oldest Votes. So the length will be always same. Update: I do not know what type 4 means in the case.?

Version 1 UUIDs are generated from a time and a node id usually the MAC address ; version 2 UUIDs are generated from an identifier usually a group or user id , time, and a node id; versions 3 and 5 produce deterministic UUIDs generated by hashing a namespace identifier and name; and version 4 UUIDs are generated using a random or pseudo-random number. Improve this answer. So, it's always 32 alphanumeric characters plus 4 hyphens? Yes it is. Add a comment.

Daniel Almeida Daniel Almeida 41 1 1 bronze badge. That's a nice idea, for instance I have to integrate a UUID-v4-based identifiers system with another system which limits IDs to 30 charactes max length. For those like me that start googling before reading the javadoc, here the javadoc ; UUID. Sign up or log in Sign up using Google. Sign up using Facebook. You may convert UUIDv4 16 bytes binary to 24 bytes ascii using base64, instead encode to ascii-hex 32 bytes For those like me that start googling before reading the javadoc, here the javadoc ; UUID.

Why isn't there a openjdkjdk package on debian anymore? How to generate new, bit Diffie-Hellman parameters with Java keytool? How can I upgrade to Java 1. The 14 bit clock sequence value is constructed from the clock sequence field of this UUID. The clock sequence field is used to guarantee temporal uniqueness in a time-based UUID. The 48 bit node value is constructed from the node field of this UUID. The node value is only meaningful in a time-based UUID, which has version type 1. Object , System.

Object equals public boolean equals Object obj Compares this object to the specified object. The result is true if and only if the argument is not null , is a UUID object, has the same variant, and contains the same value, bit for bit, as this UUID.

Overrides: equals in class Object Parameters: obj - The object to be compared Returns: true if the objects are the same; false otherwise See Also: Object. The UUID is generated using a cryptographically strong pseudo random number generator. A UUID actually a bit value 2 long. In string format it also contains 4 - that's why the length is Here type 4 means this uuid is generated using a random or pseudo-random number. For both variants 1 and 2, five "versions" are defined in the standards, and each version may be more appropriate than the others in specific use cases.

Version is indicated by the M in the string representation. In addition to fedorqui's correct answer, I would like to show the difference between string length and byte length:. But there left some strange UTF-8 behaviour, like double-spaced chars, zero spaced chars, reverse deplacement and other that could not be as simple