요청 내용
“Create an observer-pattern UML class diagram where Stock implements Subject and Investor and PriceDisplay implement Observer for stock price updates.”
그렇다면Add a NewsDisplay observer.Add a volume field to Stock.
이 도면에 담긴 내용
그 이면의 의사결정을 읽어 보세요.
01
Modeled Subject and Observer as interfaces for extensibility.
02
Used aggregation to show the subject holds a collection of observers.
03
Added directed associations from observers back to the subject for state retrieval.
When designing systems requiring one-to-many dependencies and automatic notifications, such as event handling, monitoring, or publish-subscribe mechanisms.