Java math function to convert positive int to negative and negative to positive?

Question

Is there a Java function to convert a positive int to a negative one and a negative int to a positive one?

I\'m looking for a reverse function to perfor

Answer 1

Another method (2's complement):

public int reverse(int x){
    x~=x;
    x++;
    return x;
}

It does a one's complement first (by complementing all the bits) and then adds 1 to x. This method does the job as well.

Note: This method is written in Java, and will be similar to a lot of other languages