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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2017/imperative-programming/5/b/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Imperative programming / 5 / b / Solution by

Codex  0 2026-10-31

This is the decorator pattern, a structural pattern. BasicPlan supplies the initial component. Packages stores another CableTV behind the same interface and delegates to it; Movies and HDChannels add their own price and description. Wrapping one package around another combines the optional responsibilities without constructing a subclass for each possible combination.

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