Java Map MCQs with answers Page - 7

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 method returns a shallow copy of a Map?

  • (A) clone()
  • (B) copy()
  • (C) duplicate()
  • (D) replicate()

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Q. What happens if you pass a null key to `TreeMap`?

  • (A) It stores the key
  • (B) It throws NullPointerException
  • (C) It replaces previous null key
  • (D) It is ignored

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Q. What is returned by `computeIfPresent()` in Map?

  • (A) New value if computation succeeds
  • (B) Key
  • (C) Old value
  • (D) Nothing

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Q. What will `map.getOrDefault(“key”, “default”)` return if key is not found?

  • (A) Exception
  • (B) null
  • (C) “default”
  • (D) 0

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Q. Which is the default load factor of HashMap?

  • (A) 0.5
  • (B) 0.65
  • (C) 0.75
  • (D) 1.0

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Q. Which Map implementation is sorted and allows null values but not null keys?

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

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Q. Which of the following guarantees thread-safety?

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

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Q. Which of the following operations is NOT supported by `Map.of()`?

  • (A) Iteration
  • (B) Reading values
  • (C) Adding new entries
  • (D) Accessing keys

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Q. Which Map is ideal for maintaining access order?

  • (A) TreeMap
  • (B) LinkedHashMap with accessOrder=true
  • (C) HashMap
  • (D) EnumMap

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Q. Which method in the Map interface is used to remove a mapping only if the key is mapped to a specific value?

  • (A) remove()
  • (B) removeIfMatch()
  • (C) conditionalRemove()
  • (D) remove(key, value)

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