I'm working with byte arrays for a program at the moment, and I was
wondering...

Is there standard java method that returns a sub-array of an array?
(I can code this myself, but I'm just wondering if there's a standard
class hidden away somewhere.)

Is there a way to see whether an array contains another array as a
subarray of it? (in sequence, not scattered through the array) (I'm
not sure how to code this if there isn't a standard class, any help
would be appreciated).

And do byte-related methods in java always assume the bytes are
signed?