StudentObserver
-departmentName : String
TeacherObserver
Observer
+update() : void
notifyObservers
Department
-departmentName :String = \"南工\"
+getDepartmentName() : String+setDepartmentName(String departmentName) : void
Observable
-changed : boolean -obs : Vector
+addObserver(Observer o) : void+deleteObserver(Observer o) : void+notifyObservers() : void#setChanged() : void .....
