Java 8 will have some support for unsigned integers

This seemed to be good news at first. An announcement by Oracle’s Joe Darcy claiming that Java will finally have *some* support for unsigned integers:

This will only be added on an API level, though. Not on a language level including all the expected features:

  • Primitive types
  • Wrapper types
  • Arithmetics
  • Casting rules
  • Boxing / Unboxing

A very “light” implementation of what could be expected… In the mean time, if you do need wrapper types, feel free to download (and contribute) to jOOU:

See also my previous blog post about jOOU:

Java’s missing unsigned integer types

Java’s missing unsigned integer types

This is a topic that has been discussed many times before. Java’s lack of unsigned byte/short/int/long types. The main reasons why the JLS designers omitted those types were:

  1. They’re hardly really useful
  2. They’re a bit more difficult to implement
  3. They’re a bit more difficult to understand
  4. They would lead to more primitive types that have to be treated separately from the existing ones
  5. … and probably, there are more reasons

Nevertheless, these types are sometimes useful for cryptography, image processing, binary protocols, everything related to binary data (why is byte unsigned after all??), and the list of rants in the following ticket at Sun/Oracle is long:

For jOOQ, unsigned number types would be useful, as some databases support them (e.g. MySQL, Postgres). And they’re not necessarily trivial to map to Java. So I was looking for a good solution. The best one being to use wrapper classes extending java.lang.Number. So, I have raised the question on Stack Overflow to find such a library:

Incredibly, no one seems to have done this – except for some partial implementations in some large libraries. So I’m launching a new OSS project called jOOU – U is for Unsigned. Check out a small library for Java Unsigned Number wrappers: