How to compare Boolean?

Question

Take this for example (excerpt from Java regex checker not working):

while(!checker) {
    matcher = pattern.matcher(number);
    if(matcher.find())
                 


        

Answer 1

Regarding the performance of the direct operations and the method .equals(). The .equals() methods seems to be roughly 4 times slower than ==.

I ran the following tests..

For the performance of ==:

public class BooleanPerfCheck {

    public static void main(String[] args) {
        long frameStart;
        long elapsedTime;

        boolean heyderr = false;

        frameStart = System.currentTimeMillis();

        for (int i = 0; i < 999999999; i++) {
            if (heyderr == false) {
            }
        }

        elapsedTime = System.currentTimeMillis() - frameStart;
        System.out.println(elapsedTime);
    }
}

and for the performance of .equals():

public class BooleanPerfCheck {

    public static void main(String[] args) {
        long frameStart;
        long elapsedTime;

        Boolean heyderr = false;

        frameStart = System.currentTimeMillis();

        for (int i = 0; i < 999999999; i++) {
            if (heyderr.equals(false)) {
            }
        }

        elapsedTime = System.currentTimeMillis() - frameStart;
        System.out.println(elapsedTime);
    }
}

Total system time for == was 1

Total system time for .equals() varied from 3 - 5

Thus, it is safe to say that .equals() hinders performance and that == is better to use in most cases to compare Boolean.