Please specify where each code ends with asterisks thanks.

A design pattern is a general reusable solution to a commonly occurring problem in software design. Design patterns are not finished products but rather represent "best practices" used by experienced 0O software developers. One such common pattern is the "Observer Pattern". The UML diagram for the Observer pattern is s > observers > Observer update Subject registerObserverO removeObserver) notifyObservers) subject ConcreteObserver ConcreteSubject registerObserver0 removeObserver(O notifyObservers) update(0 / other Observer-specific methods getState0 setState()