Observer Design Pattern (Software Design Patterns Tutorial)

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******************** Observer Design Pattern:
It falls under behavioral design pattern.
Object (Subject) maintains all its dependents called observers.
One to many dependencies between objects. One object changes state and all its dependents are notified and updated automatically.
Observer Design Pattern is also called Listener Design Pattern.
Subject (Publisher) doesn’t need to know anything about the observers (subscriber or listeners).
Very loose coupling
Limitation: Subject (Publisher) may send updates that may don’t make sense to the observers (listeners).

For more details check out: https://programmingline.com/software-design-patterns/observer-design-pattern

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