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For a programming language to be a true OOP language, the language must meet the following criteria:
Abstraction—Abstraction manages the complexities of a business problem by allowing you to identify a set of objects involved with that business problem.
Encapsulation—Encapsulation hides the internal implementation of an abstraction within the particular object.
Polymorphism—Polymorphism provides for multiple implementations of the same method. For example, different objects can have a Save method, each of which perform different processing.
Inheritance—The excitement of Visual Basic .NET lies in inheritance. Visual Basic 5 introduced the concept of interface inheritance, which allows you to reuse the interface of a class, but not its implementation. Visual Basic .NET provides for true implementation inheritance whereby you can reuse the implementation of a class.
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