7.2. Three Distinguishing Features of an OOPL
We now defined all three of the features required to make a language truly object-oriented:
(Programmer creation of) User-defined types
Inheritance
Polymorphism
By way of review, here is a summary of the benefits of each of these language features.
Programmer creation of user-defined types
Provides an intuitive way to represent real-world objects, resulting in easier-to-verify requirements.
Classes are convenient units of reusable code, which means less code to write when building an application.
Through encapsulation, we minimize data redundancy—each item of data is stored once, in the object to which it belongs—and therefore lessen the chance of data integrity errors.
Through information hiding, we ...
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