Using the UML graphical notation for object classes, design the following object classes, identifying attributes and operations. Use your own experience to decide on the attributes and operations that should be associated with these objects.
• a messaging system on a mobile (cell) phone or tablet
• a printer for a personal computer
• a personal music system
• a bank account
• a library catalogue
There are many possible designs here and a great deal of complexity can be added
to the objects. However, I am only really looking for simple objects which
encapsulate the principal requirements of these artefacts. Possible designs are
shown in the following diagram.
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