R

Ram Sharma • 3.40K Points
Extraordinary

Q. What happens if duplicate keys are provided in `Collectors.toMap()` without a merge function?

  • (A) Keeps the first key
  • (B) Throws an exception
  • (C) Overrides the previous value
  • (D) Creates a list of values
  • Correct Answer - Option(B)
  • Views: 17
  • Filed under category Java
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Explanation by: Ram Sharma

`Collectors.toMap()` throws `IllegalStateException` on duplicate keys unless a merge function is supplied.

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