Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

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Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Does MapEntry use the key’s hashCode() for hashing?

  1. Yes

  2. No

  3. Only if the key is a String

  4. Only for null keys

The correct answer is: Yes

MapEntry does use the key's hashCode() method for hashing as it is used to determine the index in the hash table where the key-value pair will be stored. Option B is incorrect because if the hash code is not used for hashing, then the key-value pair will be stored in a default index, which can result in slower retrieval time. Option C is incorrect because it implies that only String keys use the hashCode() method, which is not true as any object can override this method. Option D is incorrect because the hashCode() method is used for all keys, including null keys.

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