Regarding the HexString method in Integer?

Question

I would like to convert a byte to its hexadecimal from a string, when I use the method Integer.toHexString, a positive number is ok, but a negative number is output as something like ffffffa7, I would like to get two char strings, how to do it?

Why is there no method in the Byte class toHexString?

Answer 1

You can use String.format :

String.format("%02x", value)