Class-based OOP
我们已经知道了class-based OOP是OOP的一个流派，本文将对class-based OOP进行详细分析。
维基百科Class-based programming
原文在很多下面这段话我觉得非常具有启发性
Object-oriented programming is more than just classes and objects; it's a whole programming paradigm based around objects (data structures) that contain data fields and methods. It is essential to understand this; using classes to organize a bunch of unrelated methods together is not object orientation.
Junade Ali, Mastering PHP Design Patterns
Class-based OOP的特性
Class-based OOP的特性：
1) Abstraction
在tutorialsteacher Dependency Inversion Principle中有这样的描述：
Abstraction and encapsulation are important principles of object-oriented programming.
2) Inheritance
3) Encapsulation
4) Polymorphism
在维基百科Design Patterns#Introduction, Chapter 1中有这样的描述：
Use of an interface also leads to dynamic binding and polymorphism, which are central features of object-oriented programming.
本段参考的内容有：
Design
参见Theory\Design-pattern\OOP-design-pattern章节。