Java Interview Questions · interview question

What deeper point about Primitive Types and Wrappers should a senior Java developer mention?

Multiple choiceHardjava-interview-2026interviewjavaadvanced

Autoboxing can add allocation cost, hidden unboxing work, and NullPointerExceptions when a wrapper unexpectedly contains null.At senior level, any approach to Primitive Types and Wrappers is equally correct if it compiles and passes a small test.At senior level, the JVM removes the tradeoffs around Primitive Types and Wrappers, so design choices barely matter.At senior level, the right answer is that Primitive Types and Wrappers exists mostly for historical syntax reasons.

Answer and explanation

Correct answer

A. Autoboxing can add allocation cost, hidden unboxing work, and NullPointerExceptions when a wrapper unexpectedly contains null.

Why

Autoboxing can add allocation cost, hidden unboxing work, and NullPointerExceptions when a wrapper unexpectedly contains null. This is the kind of tradeoff-aware answer senior interviews usually expect.

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What deeper point about Primitive Types and Wrappers should a senior Java developer mention?

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