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Which practice avoids a common mistake with HashSet vs TreeSet?

Multiple choiceMediumjava-interview-2026interviewjavapitfall

Prefer the version of HashSet vs TreeSet that makes behavior less predictable as long as the code compiles.Do not choose TreeSet when hash-based uniqueness is enough and sorting adds no product value.Silence the HashSet vs TreeSet problem by using raw types, broad catches, or shared mutable state.Ignore the HashSet vs TreeSet issue and rely on team discipline instead of APIs or contracts.

Answer and explanation

Correct answer

B. Do not choose TreeSet when hash-based uniqueness is enough and sorting adds no product value.

Why

Do not choose TreeSet when hash-based uniqueness is enough and sorting adds no product value. This is a common failure mode in real Java code and a frequent interview follow-up.

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Which practice avoids a common mistake with HashSet vs TreeSet?

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