OOP Course:: 
In this chapter we look briefly at substitution again, but in the context of programmer-generated classes. We then incorporate dynamic binding to extend substitution to the concept of polymorphism. This leads naturally to an exploration of abstract classes. The concepts of substitution, polymorphism and abstract classes are closely tied to the concept of subtyping and all three of these are important aspects of many OO patterns.
In this chapter we look briefly at substitution again, but in the context of programmer-generated classes. We then incorporate dynamic binding to extend substitution to the concept of polymorphism. This leads naturally to an exploration of abstract classes. The concepts of substitution, polymorphism and abstract classes are closely tied to the concept of subtyping and all three of these are important aspects of many OO patterns.
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