Abstract classes, Interfaces, and Patterns
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The Observer pattern revisited
It adds flexibility to the
Observer
pattern if an Observer implements the interface
IObserver
Observer
A WeatherCenter (subject) and Watcher (observer) with interfaces.
Application of the two different Watchers.
Output of the WeatherCenter and Watchers application.
The
IObserver
interface captures the only necessary property of a class that plays the role as an observer
