bitwise & doesn't work with bytes in kotlin

Question

I\'m trying to write kotlin code like:

for (byte b : hash)  
     stringBuilder.append(String.format(\"%02x\", b&0xff));

but I have not

Answer 1

Bitwise "and" of any byte-value and 0xff will always return the original value.

It is simple to see this if you draw the bits in a diagram:

00101010   42
11111111   and 0xff
--------
00101010   gives 42