OOP技术由对象、消息、方法、类和继承五个方面组成。

OOP consists of five aspects: object, message, method, class and inheritance.

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总之，该部分讨论了UML和类图、继承、多态性、封装…一些应该在开头为您介绍的东西。

Anyway, this section talks about UML and class diagrams, inheritance, polymorphism, encapsulation... things they should have shown you in the beginning.

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本文假设读者熟悉基本的面向对象概念，比如类、对象、方法和继承。

This article assumes you are familiar with basic object-oriented concepts, such as classes, objects, methods, and inheritance.

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