java中无符号类型的第三方库jOOU

java中整数默认都是有符号类型的，在进行第三方库或者c/c++调用时有时候需要无符号类型。

比如海康威视SDK调用

常见的无符号类型 unsigned int, unsigned char, unsigned short, unsigned byte, unsigned long.

以下介绍一个三方库jOOU， github地址 https://github.com/jOOQ/jOOU,他能支持 unsigned byte/short/int/long不过不支持char。

java是unicode字符集，utf-8编码，char默认应是双字节的。

官方介绍：

jOOU - Unsigned Integers jOOU provides unsigned integer versions for the four Java integer types byte, short, int and long.

用法：（java6-8）

<dependency>
  <groupId>org.jooq</groupId>
  <artifactId>joou-java-6</artifactId>
  <version>0.9.4</version>
</dependency>

there is a utility class called org.joou.Unsigned with factory methods allowing for creating unsigned wrappers like this:

import static org.joou.Unsigned.*;

// and then...
UByte    b = ubyte(1);
UShort   s = ushort(1);
UInteger i = uint(1);
ULong    l = ulong(1);

其他支持无符号类型的库Guava

Generic utilities

These methods' signed analogues are provided in the wrapper classes in the JDK.

UnsignedLongs, UnsignedLong, UnsignedBytes, UnsignedInteger, UnsignedInts,