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Which practice avoids a common mistake with HashMap Internals?

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Do not use mutable key fields that can change the hash-relevant state after insertion.Silence the HashMap Internals problem by using raw types, broad catches, or shared mutable state.Ignore the HashMap Internals issue and rely on team discipline instead of APIs or contracts.Prefer the version of HashMap Internals that makes behavior less predictable as long as the code compiles.

Answer and explanation

Correct answer

A. Do not use mutable key fields that can change the hash-relevant state after insertion.

Why

Do not use mutable key fields that can change the hash-relevant state after insertion. 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 HashMap Internals?

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