Simple One but ....

In the past 5+ years of my experience as a Jave Panelist for the recuritment drives in company, most regular question by me is this

What is static? What does it mean when a method is declared static - Ofcourse the most obvious answers would be - Static means only one instance per class. And when method is static, only one instance exists for that class. - Immediately my reaction would be a sharp smile as the candidate fell into trap.

My next question is - Then i have a method called add as below.

public static void add (int a, int b) {
int sum = 0;
sum = a + b;
System.out.println("Sum equals -- " + sum);
}

What is the result when two concurrent threads access the same method with inputs (3,4) and (4,5).

Will the execution gives right results or wrong results? if so why?
about 99% of cases have this wrong by first saying right results and when i point back to their definition of having a single instance and stressing on 2 concurrent threads, answer changes to defining the method syncronized. Then to further test his reasoning, i would say, so do you mean every method declared static should have syncronized as mandatory. Bowled!!!!!

Any tries are welcome..will exlain later...

Note: this is just to explain/test a simple java basic, not that i am saddist with the candidates. Having got bored asking typical questions as listed in many websites - java intervew questions etc., try asking un-orthodox questions.