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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2019/imperative-programming/6/b/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2019 / Imperative programming / 6 / b / Solution by

Codex  0 2026-10-25

The essential abstract methods are:

def hasNext: Boolean
def next(): T

hasNext reports whether another result is available. next() returns that result and advances; if exhausted, it throws NoSuchElementException. The other ordinary iterator operations are implemented using these primitives. An availability check must not silently discard a result visible to the client, although an adapter may need to fetch and cache underlying values in order to decide availability.^[ref]

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