A design class represents an abstraction of one or several classes in the system’s implementation ; exactly what it corresponds to depends on the implementation language. For example, in an object-oriented language such as C++, a class can correspond to a plain class.
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There are three ways to design classes: by composition, via inheritance, and via interface . Composition (or aggregation) is achieved by using existing class as a part of a new class. For example, the ArrayStack class includes an array of objects. Inheritance allows you to define a new class in terms of an old class.
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