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Declarations and Access Control - Programming

Q1:

Which three are valid method signatures in an interface?
  1. private int getArea();
  2. public float getVol(float x);
  3. public void main(String [] args);
  4. public static void main(String [] args);
  5. boolean setFlag(Boolean [] test);

A 1 and 2

B 2, 3 and 5

C 3, 4, and 5

D 2 and 4

ANS:B - 2, 3 and 5

(2), (3), and (5). These are all valid interface method signatures. (1), is incorrect because an interface method must be public; if it is not explicitly declared public it will be made public implicitly. (4) is incorrect because interface methods cannot be static.