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Building Applications and Components with Visual Basic .NET
book

Building Applications and Components with Visual Basic .NET

by Ted Pattison, Dr. Joe Hummel
October 2003
Intermediate to advanced content levelIntermediate to advanced
592 pages
13h 42m
English
Addison-Wesley Professional
Content preview from Building Applications and Components with Visual Basic .NET

Abstract Classes

All classes can be separated into two categories: classes that are creatable and classes that are not creatable. Classes are creatable if they support object instantiation using the New operator. Classes are not creatable if they do not support object instantiation. In object-oriented terminology, creatable classes are referred to as concrete classes, whereas noncreatable classes are referred to as abstract classes.

The term “concrete class” reinforces the notion that you must have a class definition with a concrete implementation to create an object. Conversely, the term “abstract class” implies that the class definition does not have a concrete implementation. Instead, an abstract class defines a programming contract along ...

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Publisher Resources

ISBN: 0201734958Purchase book