Java Map MCQs with answers Page - 1

You will find multiple-choice questions (MCQs) related to #Java Map here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. Which interface in Java defines a key-value pair collection?

  • (A) Set
  • (B) List
  • (C) Map
  • (D) Queue

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Q. Which Map implementation maintains the insertion order?

  • (A) HashMap
  • (B) TreeMap
  • (C) LinkedHashMap
  • (D) Hashtable

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Q. Which of the following is synchronized?

  • (A) HashMap
  • (B) TreeMap
  • (C) Hashtable
  • (D) LinkedHashMap

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Q. Which Map does not allow null keys or null values?

  • (A) Hashtable
  • (B) HashMap
  • (C) LinkedHashMap
  • (D) TreeMap

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Q. Which Map implementation maintains keys in sorted order?

  • (A) HashMap
  • (B) TreeMap
  • (C) LinkedHashMap
  • (D) EnumMap

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Q. What does the `put()` method return in a Map?

  • (A) Nothing
  • (B) The new value
  • (C) The previous value associated with the key
  • (D) The key

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Q. Which method retrieves a value for a given key from a Map?

  • (A) getKey()
  • (B) fetch()
  • (C) get()
  • (D) lookup()

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Q. Which of the following methods will remove all mappings from a Map?

  • (A) delete()
  • (B) removeAll()
  • (C) clear()
  • (D) reset()

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Q. Which Map implementation is best suited for enum keys?

  • (A) HashMap
  • (B) EnumMap
  • (C) TreeMap
  • (D) LinkedHashMap

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Q. Which method returns a Set view of the keys in a Map?

  • (A) keySet()
  • (B) keys()
  • (C) entrySet()
  • (D) getKeys()

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