The \b[<observer pattern> is a <behavioral design pattern>] defining a one-to-many dependency. When a subject changes relevant state, it notifies registered observers so they can update. The subject uses an observer interface rather than hard-coding each concrete dependent, allowing subscriptions to vary.

Solution

Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Imperative programming (resit) / 8 / a / Solution

 Solution (source code)