Why output is "127"

Question

public class Program
{
public static void main(String[] args) {
byte x =-128;
--x;
System .out .println (x);

}
}

Answer 1

The byte primitive data type has a range from -128 to +127.
If you decrease the minimum amount then it overflows to the maximum.
https://www.w3schools.com/java/java_data_types.asp

Answer 2

That's because of 'overflow'.

Each number type has a certain range of numbers it can contain, depending on the allocated memory.

If the number goes out of range, it jumps to the other end of the spectrum.