Q. Which of these is the most popularly used class as a key in a HashMap?

  • (A) String
  • (B) Integer
  • (C) Double
  • (D) All of the above
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✅ Correct Answer: (B) Integer

Published by Tina Singh ⭐ 14.41K Points at 26-Aug-2022 06:30 pm in JAVA

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