Java Interview Questions · interview question
When should a Java developer choose HashSet Membership and Deduplication deliberately?
Multiple choiceMediumjava-interview-2026interviewjavause
Answer and explanation
Correct answer
C. Use HashSet to remove duplicates, detect repeats, and support O(1)-style average membership checks in interview solutions.
Why
Use HashSet to remove duplicates, detect repeats, and support O(1)-style average membership checks in interview solutions. Interviewers often ask this to see whether you can connect the concept to real design decisions.
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