Question

What’s the difference between calling a method through an object vs a class.

for example the Class Bob

public class SecretNumber() {
    public static int secretNumber = 2;
    public static void changeSecretNumber(){
        secretNumber++;
    }
}

What would be the difference if i called it like an object

SecretNumber secretNumber = new SecretNumber();
secretNumber.changeSecretNumber();

vs calling it like this

SecretNumber.changeSecretNumber();

How would one method effect the other?

Answer 1

The result is the same.

You should call it by class name, not through the instance, because no dynamic dispatch happens.

Most compilers will give you a warning, if you do that, too. Some people argue that it should have been made a compile error.