Can void method be defined using dot notation?

Question

I've just started learning Java and I am stuck at this MCQ:

Assume class Temp is defined as belowand the statment Temp a= new temp() is successfully executed Which of the statement is illegal in Java?

class Temp {
 public static int i;
 public void method1() { }
 public static void method2() { }
}

A. System.out.println(i);

B. Temp.method1();

C. a.method1();

D. Temp.method2();

The answer is B, but I can't understand why. Is it because a void method cannot be defined using the dot notation unless it's static?

`method1` is not static, in other words you have to create a `Temp` class instance before calling this method. — , Oct 12 '17 at 11:58
It has nothing to do with the return type of `void`. You simply can't call an *instance* method *statically*. — David, Oct 12 '17 at 11:58
@Henry exactly! I thought the answer is A, the reason being i is not initialized? — nerv21, Oct 12 '17 at 12:07
Not because of that, but it should be `System.out.println(Temp.i);` — Henry, Oct 12 '17 at 12:15
@Henry: I guess the difference is that `System.out.println(i);` is correct when beeing called from class Temp (In which case you don't need to add the classname in front of it) but `Temp.method1();` is wrong no matter from where in your code you try to call it. — OH GOD SPIDERS, Oct 12 '17 at 12:23
@OHGODSPIDERS that would be an explanation, but on the other hand "class Temp is defined as below" and there is no further code in it. — Henry, Oct 12 '17 at 12:28

score 0 · Answer 1 · answered Oct 12 '17 at 11:58

0

Because method1 is non-static method. You can use methods with class names only if they are static. Look here for more details.

answered Oct 12 '17 at 11:58

saidfagan

1 Answers1