Most efficient method of performing &&?

Question

I've got a common situation where you have two variables (xSpeed and ySpeed) which I want to independently set to zero when they fall below minSpeed, and exit when they're both zero.

What would be the most efficient method? Currently I have two methods (Method 2 being cleaner), but I was wondering if you guys knew a better way....

Method1:

bool isZeroX = Math.abs(xSpeed)< minSpeed;
bool isZeroY = Math.abs(ySpeed)< minSpeed;

if(isZeroX && isZeroY) return -1;
else if(isZeroX) xSpeed = 0;
else if(isZeroY) ySpeed = 0;

Method2:

if(Math.abs(xSpeed)< minSpeed) xSpeed = 0;
if(Math.abs(ySpeed)< minSpeed) ySpeed = 0;
if(ySpeed==0 && xSpeed==0) return -1;

Answer 1

You can do

if(-minSpread < xSpeed && xSpeed < minSpeed) {
    xSpeed = 0;
    if(-minSpread < ySpeed && ySpeed < minSpeed) {
        ySpeed = 0;
        return -1;
    }
} else if(-minSpread < ySpeed && ySpeed < minSpeed) {
    ySpeed = 0;
}

Answer 2

I prefer your second example because it is the most readable. Prefer readability over efficiency unless you can prove that you should be optimising.

Answer 3

Perhaps make an elegant boolean method to see if the object is moving/stopped:

boolean isStopped() {
    if(Math.abs(xSpeed)< minSpeed) xSpeed = 0;
    if(Math.abs(ySpeed)< minSpeed) ySpeed = 0;

    return (ySpeed==0 && xSpeed==0);
}