Core Java · interview question
Which Java collection would be most appropriate for storing unique product IDs in an e-commerce catalog?
Multiple choiceMediumchapter-4-curatedpremiumcore-javaequals-and-hashcode-in-collections
Answer and explanation
Correct answer
C. HashSet
Why
A HashSet is most appropriate for storing unique product IDs because it automatically ensures that no duplicates are stored. It uses the hashCode and equals methods to check for duplicates, making it efficient for lookups and insertions.
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