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Java: In Java, which comparison about HashSet Membership and Deduplication is accurate?

Difficulty:

Easy

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

In Java, which comparison about HashSet Membership and Deduplication is accurate?

  1. There is no practical difference in behavior, performance, or API design when HashSet Membership and Deduplication is involved.
  2. The oldest option related to HashSet Membership and Deduplication is always the right production choice regardless of context.
  3. It is better than a List for repeated contains checks when order and duplicates are not important.
  4. Differences around HashSet Membership and Deduplication are mostly cosmetic, so correctness and maintainability do not change.

Hint

Focus on the behavior or tradeoff, not just the keyword.

Answer and rationale

Correct answer: C. It is better than a List for repeated contains checks when order and duplicates are not important.

It is better than a List for repeated contains checks when order and duplicates are not important. This is the comparison that usually separates memorization from understanding.

Track: Java