Converting Signed Int to Unsigned String value in Java

Question

To keep this short, I am getting a signed number, -25771 (in Java), that I need the unsigned String representation of, which is "4294941525". Java thinks the number is signed two's complement, but I need its unsigned value.

I noticed the Javadoc for the toString() method for Integers only converts to signed representation.

Is there not a bitwise operation such as "& 0xFF" that I can do to get the unsigned number?

Answer 1

I would try

int val = -25771;
System.out.println(Long.toString(val & 0xFFFFFFFFL));

prints

4294941525

or

"" + (val & 0xFFFFFFFFL)

Answer 2

In Java 8, you can just use Integer.toUnsignedString(int i).

Answer 3

You can use Guava's UnsignedInts.toString, and parseUnsignedInt to reverse the process.