Why can't I pass two arguments to a method?

Question

Java

Why can't I pass two arguments to a method?

public class FirstClass {
    public static int main(String[] args) {

         static int foo(int b, int a){
            int c;
            c = a + b;
            return c;
        }
    }
}

Answer 1

And the method in the method is legal from the point of view. Javas?
Move foo out of main, this is most likely the reason.