Java Interview Questions · interview question

Which practice avoids a common mistake with StringBuilder vs StringBuffer?

Multiple choiceMediumjava-interview-2026interviewjavapitfall

Ignore the StringBuilder vs StringBuffer issue and rely on team discipline instead of APIs or contracts.Silence the StringBuilder vs StringBuffer problem by using raw types, broad catches, or shared mutable state.Prefer the version of StringBuilder vs StringBuffer that makes behavior less predictable as long as the code compiles.Avoid repeated string concatenation in tight loops when a mutable builder better expresses the workload.

Answer and explanation

Correct answer

D. Avoid repeated string concatenation in tight loops when a mutable builder better expresses the workload.

Why

Avoid repeated string concatenation in tight loops when a mutable builder better expresses the workload. 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 StringBuilder vs StringBuffer?

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