Discussion
Consider what ListIterator offers that Iterator does not. Which statement is correct?
Answer: B
Correct answer: Backward traversal, plus add and set as well as remove.
ListIterator extends Iterator with hasPrevious and previous for backward traversal, with add and set alongside remove, and with nextIndex and previousIndex. It is available only from a List, since it depends on positional access, and it offers no extra protection against concurrent modification.
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