Object-Oriented Analysis: Using Design Patterns by Peter Johnson

Author:Peter Johnson
Format: epub

The above implementation defines an abstract Subject class responsible for managing and notifying a list of Observers. The ConcreteSubject changes its state and calls notify() to communicate these changes. Observers, such as ConcreteObserver, respond to the update() method with the new state.

The expected output from running the above code demonstrates the notification process:

Observer: Subject’s state changed to State 1

Observer: Subject’s state changed to State 2

The Observer Pattern is widely applicable in scenarios where event subscription and notification systems are needed, such as in implementing event listeners in graphical user interfaces (GUIs) or real-time data streaming systems.

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