Random number generator with range in Java

Question

I have an array like:

byte[] a = new byte[4];

Random rnd;

    rnd.nextBytes(a);

I want to know if each element of this array named a in decimal is in range 0-255 or can be beyond this interval?

Answer 1

Java's primitive byte is a data type is an 8-bit signed two's complement integer.

That means the minimum value is -128 (-2^7) and the maximum value is 127 (inclusive)(2^7 -1)

if you need or want a range between 0 and 255 you will need to correct the random number by yourself.

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And btw, Random class must be initialized before you do something like:

rnd.nextBytes(a);