说明：  Delphi语言作为全面支持面向对象的语言，在程序设计中引入了类、对象、封装、继承、多态和抽象等概念。本文把Delphi所支持面向对象的特性作以全面探讨，并给出部分例子，
(Delphi as part of a comprehensive support object-oriented languages, in the process of introduction of the category, target, encapsulation, inheritance, polymorphism and abstract concepts. In this paper, Delphi supports the object-oriented characteristics for a comprehensive study, and gives some examples.)