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63. Observer Sample

The Observer ( download ) sample illustrates the Observer design pattern as follows:

WeatherDataInterface defines the subject interface to register, remove, and notify the observers.

Observer Sample

ParaWeatherData is the Concrete Subject generating "weather updates".
There are two concrete observers, CurrentConditionBoard and StatisticBoard. Both observers register themselves with the subject.
ObserverBoardInterface is the abstract Observer interface with update operation.
DisplayBoardInterface is the abstract interface with show operation.

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