Java Interview Questions · interview question

Which practice avoids a common mistake with Two-Dimensional Arrays?

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Silence the Two-Dimensional Arrays problem by using raw types, broad catches, or shared mutable state.Do not assume every row is initialized or has the same length unless your code explicitly enforces that invariant.Prefer the version of Two-Dimensional Arrays that makes behavior less predictable as long as the code compiles.Ignore the Two-Dimensional Arrays issue and rely on team discipline instead of APIs or contracts.

Answer and explanation

Correct answer

B. Do not assume every row is initialized or has the same length unless your code explicitly enforces that invariant.

Why

Do not assume every row is initialized or has the same length unless your code explicitly enforces that invariant. 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 Two-Dimensional Arrays?

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