How do you write a design class?

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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What is the class design?

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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What is a good OO design?

Gamma’s second principle of good OO design is to: Favor object composition over class inheritance . Systems that follow this rule have fewer classes and more objects. Their power is in the ways that the objects can interact with each other. It would be important to have good dynamic models.

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