Converting Signed Int to Unsigned String value in Java

java binary unsigned signed representation
Alex W picture Alex W · May 16, 2012 · Viewed 9.7k times · Source

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

Peter Lawrey picture Peter Lawrey · May 16, 2012

I would try

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

prints

4294941525

or

"" + (val & 0xFFFFFFFFL)

Related questions

Converting an int to a binary string representation in Java?

What would be the best way (ideally, simplest) to convert an int to a binary string representation in Java? For example, say the int is 156. The binary string representation of this would be "10011100".

Read More
How to convert a Binary String to a base 10 integer in Java

I have an array of Strings that represent Binary numbers (without leading zeroes) that I want to convert to their corresponding base 10 numbers. Consider: binary 1011 becomes integer 11 binary 1001 becomes integer 9 binary 11 becomes integer 3 etc. What's the best way to proceed? …

Read More
How to convert a byte to its binary string representation

For example, the bits in a byte B are 10000010, how can I assign the bits to the string str literally, that is, str = "10000010". Edit I read the byte from a binary file, and stored in the byte array B. I …

Read More