Object-Oriented Programming for Edexcel A-Level Computer Science | Edexcel A-Level 计算机：面向对象编程核心概念与考试应用

📚 Object-Oriented Programming for Edexcel A-Level Computer Science | Edexcel A-Level 计算机：面向对象编程核心概念与考试应用

Object-oriented programming (OOP) is a central topic in the Edexcel A-Level Computer Science specification. It is the basis for designing reusable, maintainable and secure code. This revision guide covers the key OOP concepts you need for both Paper 1 and Paper 2 style questions, including classes, objects, encapsulation, inheritance, polymorphism and object relationships.

面向对象编程（OOP）是 Edexcel A-Level 计算机科学大纲中的核心主题。它是设计可重用、可维护且安全代码的基础。本复习指南涵盖 Paper 1 和 Paper 2 中可能出现的 OOP 关键概念，包括类、对象、封装、继承、多态和对象关系。

1. Programming Paradigms: Procedural vs Object-Oriented | 编程范式：过程式与面向对象

A programming paradigm is a fundamental style or way of programming. Procedural programming structures code as a sequence of instructions and functions that operate on data. Object-oriented programming instead organises code around objects, which combine data and the methods that act on that data.

编程范式是一种基本的编程风格或方式。过程式编程将代码结构化为一系列操作数据的指令和函数。而面向对象编程围绕对象来组织代码，对象将数据及操作这些数据的方法组合在一起。

• Procedural: separates data and functions; uses top-down design; examples include C, Pascal and older BASIC. | 过程式：将数据与函数分离；使用自顶向下设计；例如 C、Pascal 和早期 BASIC。
• Object-oriented: bundles data and methods; supports abstraction, encapsulation and reuse; examples include Java, C++ and Python. | 面向对象：将数据和方法捆绑；支持抽象、封装和重用；例如 Java、C++ 和 Python。

2. Classes and Objects | 类与对象

A class is a template or blueprint that defines the attributes and methods common to all objects of a certain kind. It does not store actual data itself; rather, it describes what data and behaviour its objects will have.

类是定义某一类对象共有属性和方法的模板或蓝图

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