How can I read a file as unsigned bytes in Java?

Question

How can I read a file to bytes in Java?

It is important to note that all the bytes need to be positive, i.e. the negative range cannot be used.

Can this be d

Answer 1

If using a larger integer type internally is not a problem, just go with the easy solution, and add 128 to all integers before multiplying them. Instead of -128 to 127, you get 0 to 255. Addition is not difficult ;)

Also, remember that the arithmetic and bitwise operators in Java only returns integers, so:

byte a = 0;
byte b = 1;

byte c = a | b;

would give a compile time error since a | b returns an integer. You would have to to

byte c = (byte) a | b;

So I would suggest just adding 128 to all your numbers before you multiply them.