Discussion
Which one of the following statements about whether an Iterator can be used a second time is true?
Answer: A
Correct answer: No; once exhausted it must be replaced by a new iterator from the collection.
An Iterator is a one-shot cursor with no reset: once hasNext returns false it stays false, and calling next throws NoSuchElementException. To traverse again a fresh iterator must be obtained from the collection. That is why an enhanced for loop, which creates an iterator each time, may be written repeatedly while a stored iterator may not be reused.
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