MessageClassDiagram Answer

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Develop a class diagram for a Message class for a cell phone company. Include generalizations for child
classes TextMessage, VideoMessage, and VoiceMessage.
The Message class has attributes of account number and price. In addition it has the methods
getInfo(accountNum) and calcPrice().
The subclasses each have one additional attribute of thier own. TextMessage has characterLength,
VideoMessage has messSize and VoiceMessage has numMinutes.
Each subclass overrides the methods of the superclass with thier own. No getter or setter methods need to
be documented.
Use UMLet to draw the diagram, then copy and paste (or export an image and imp