Multiple choice

Which of the following methods of Map interface throw(s) NullPointerException in Java?

  1. public boolean containsValue(Object value)

  2. public boolean containsValue(Object key)

  3. boolean isEmpty()

  4. both (1) and (2)

  5. none of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, these method throw NullPointerException.

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