Java Interview Questions · interview question

Which practice avoids a common mistake with ArrayDeque as a Queue?

Multiple choiceMediumjava-interview-2026interviewjavapitfall

Silence the ArrayDeque as a Queue problem by using raw types, broad catches, or shared mutable state.Do not treat ArrayDeque as thread-safe; concurrent producers and consumers need concurrent queue types instead.Ignore the ArrayDeque as a Queue issue and rely on team discipline instead of APIs or contracts.Prefer the version of ArrayDeque as a Queue that makes behavior less predictable as long as the code compiles.

Answer and explanation

Correct answer

B. Do not treat ArrayDeque as thread-safe; concurrent producers and consumers need concurrent queue types instead.

Why

Do not treat ArrayDeque as thread-safe; concurrent producers and consumers need concurrent queue types instead. 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 ArrayDeque as a Queue?

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