Java Interview Questions · interview question

Which practice avoids a common mistake with ConcurrentHashMap and Concurrent Collections?

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Ignore the ConcurrentHashMap and Concurrent Collections issue and rely on team discipline instead of APIs or contracts.Prefer the version of ConcurrentHashMap and Concurrent Collections that makes behavior less predictable as long as the code compiles.Silence the ConcurrentHashMap and Concurrent Collections problem by using raw types, broad catches, or shared mutable state.Do not assume every compound read-modify-write workflow becomes safe automatically just because the collection is concurrent.

Answer and explanation

Correct answer

D. Do not assume every compound read-modify-write workflow becomes safe automatically just because the collection is concurrent.

Why

Do not assume every compound read-modify-write workflow becomes safe automatically just because the collection is concurrent. 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 ConcurrentHashMap and Concurrent Collections?

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