Overview: The Observer Design Pattern is a way to design a subsystem that allows many objects to respond automatically to changes of a particular object that's being "observed". Task: Let's say that we have a bank system and this is a main branch (observed class) and there are three branch of bank (concrete class) where is notification supposed to receive by each of those branch notifySubscribers() method. Objectives: - Create a Class UML Diagrams using the Design Patterns showing the Observer Design Pattern. - In java code, Create classes and all attributes and methods for the classes