stdint.h for Java?

Question

Is there a java library implementing the standard data types as they are available in C?

In Java everything is signed, so using byte to store uint8_t comes with some problems, for example:

byte test = (byte) 0xf3;
System.out.println("test = " + test);

prints

test = -13

instead of

test = 243

I think of something like this:

UInt8 test = new UInt8(0xf3);
System.out.println("test = " + test.toInt());

Unfortunately, no, Java doesn't have unsigned primitive types, and it's a headache when talking to embedded hardware. — chrylis -cautiouslyoptimistic-, Sep 15 '13 at 08:48
@arshajii True, I forget that `char` does technically count as an integral type. — chrylis -cautiouslyoptimistic-, Sep 15 '13 at 13:57
It's just a representation (a convention): 0xf3 == -13, where is the problem? — Aubin, Sep 15 '13 at 13:59

score 2 · Answer 1 · answered Sep 15 '13 at 08:08

2

there's a workaround, try System.out.println("test = " + (0xff & test)); you'll get 243

answered Sep 15 '13 at 08:08

Evgeniy Dorofeev

ok, but how would you use this in a code where `test` can be dynamic? it seems a little tricky to me.. – Gianmarco Sep 15 '13 at 08:33

score 0 · Answer 2 · answered Sep 15 '13 at 09:48

I don't think there is any good library that implements C/POSIX standard datatypes.

Recently I had to use predefined POSIX constants such as S_IREAD or S_IFDIR in a Java program and I had to create my own constants list class...

As @Evgeniy Dorofeev suggested, try to find workarounds :)

2 Answers2