An abstract class is an interface. A class hierarchy is a means of building classes incrementally. Naturally, every class provides an interface to users and some abstract classes provide significant functionality to build from, but ‘‘interface’’ and ‘‘building block’’ are the primary roles of abstract classes and class hierarchies.
原文链接: https://www.cnblogs.com/zhtf2014/archive/2010/08/01/1789801.html
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