NotifyObservers
NotifyObservers is a method associated with the Observer design pattern, used by a subject to inform its registered observers about a state change. The subject maintains a collection of observers and, when appropriate, calls each observer’s update method, often passing a data object that describes the change.
In typical implementations, observers register with the subject via an addObserver method and are notified when
In Java’s classic API, the java.util.Observable class provides addObserver, deleteObserver, and notifyObservers, which call update on
Considerations for notifyObservers include thread safety, as observers may be added or removed concurrently; exception handling
Example use cases include user interface components reacting to model changes, or domain objects broadcasting state