Discussion
What happens when a null element is unboxed from a List<Integer> into an int - which of the following is true?
Answer: C
Correct answer: NullPointerException.
Unboxing compiles to a call of intValue() on the Integer, and invoking that on a null reference throws. The compiler cannot reject it, since List<Integer> legitimately permits null elements and nullness is not part of the type. This is the classic hazard of autoboxing: the conversion is invisible in the source and the failure appears at run time.
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