Chapter 5 demonstrates how to create new types by declaring classes. The current chapter explores the relationship among objects in the real world and how to model these relationships in your code. This chapter focuses on specialization, which is implemented in VB.NET through inheritance. This chapter also explains how instances of more specialized classes can be treated as if they were instances of more general classes, a process known as polymorphism. This chapter ends with a consideration of not inheritable classes, which cannot be specialized, and a discussion of the root of all classes, the Object class, as well as a brief overview of nested classes.
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