Regarding toHexString method in the Integer?

Question

I would like to convert a byte to its hex from string, when I use method Integer.toHexString, the positive number is OK, but the negative number is outputed as something like ffffffa7, I would like to always get two char string, how to do that?

Why there is no toHexString method in the Byte class?

Answer 1

You can use String.format:

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