Java Interview Questions · interview question

Which practice avoids a common mistake with Fast and Slow Pointers?

Multiple choiceMediumjava-interview-2026interviewjavapitfall

Prefer the version of Fast and Slow Pointers that makes behavior less predictable as long as the code compiles.Ignore the Fast and Slow Pointers issue and rely on team discipline instead of APIs or contracts.Do not advance the fast pointer blindly without null checks, because short lists can break the traversal.Silence the Fast and Slow Pointers problem by using raw types, broad catches, or shared mutable state.

Answer and explanation

Correct answer

C. Do not advance the fast pointer blindly without null checks, because short lists can break the traversal.

Why

Do not advance the fast pointer blindly without null checks, because short lists can break the traversal. 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 Fast and Slow Pointers?

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