Want to convert Decimal from signed 2's complement to hexdecimal without signed 2's complement (ex : -73 -> B7)

Question

i am receving sensor data which sends me Decimal from signed 2's complement want to convert it to hex decimal without signed 2's complement

• Mike 'Pomax' Kamermans: And what did you find/write already to achieve that goal? Because SO is here to help you solve problems with your code, it's not a general help forum for when you have an idea but haven't done anything about it yet. Give how to ask a good question a read-through, and then update your post accordingly.
• user555045: Most things in this question make no sense to me, or are impossible. Maybe I'm wrong, but I expect that the sensor doesn't send data in decimal (a common cause for this confusion is that integers are printed in decimal by default, but that doesn't mean that the integer is decimal, it's just printed that way), but send data as a raw signed byte (which you can print in hexadecimal). Please clarify.
• Tejas Gohil: yes you are right its sends in byte but there is a default file provided by sensor manufacturer so thats decode the bytes and gives me Decimal from signed 2's complement
• user555045: Do you have to use that default file? It's still possible to convert from a decimal representation, but that's an avoidable extra step
• Community: Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer.

Answer 1

String decimal = "-73";
int number = Integer.parseInt(decimal);
String unsignedHex = String.format("%02X", number & 0xff);

The parseInt call converts the signed decimal string to a (signed) int value.

The format call converts the int to an unsigned byte string in uppercase hexadecimal:

• The number & 0xff expression strips off the sign extension.
• The "%02X" format says uppercase hexadecimal (X) in a 2 character field. The 0 means zero padded. Read Format String Syntax for more information.