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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);

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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); Answer: 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.

Question context

This question is part of ☕ Java Programming within the broader 💻 Programming subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.