nIn the object-oriented programming paradigm, we begin to consider using classes in conjunction with one another.
nWe should no longer think about classes, or objects, in isolation from one another.
nInstead of simply
creating user defined data types, we create
a hierarchy of related and interdependent classes and objects, following the natural structure of the problem.
nThis is because object-oriented programming extends the concept of data abstraction to apply across abstractions.
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