Past exam of the year 1 of the computer science course of the University of Oxford / 2021 / Imperative programming (resit) / 6 / b / Solution 2026-10-25
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The two abstract methods are
def hasNext: Boolean
def next(): T
The first reports availability; the second returns and consumes the next entry, or throws a NoSuchElementException if none exists. Other standard iterator operations are supplied in terms of this interface. Repeated availability checks must not lose entries, although they may perform preparatory internal work.[ref]
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