August 2021
Intermediate to advanced
450 pages
4h 46m
Chinese
Content preview from 面向对象的思考过程（原书第5版）
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1.6.1 创建对象
类可以认为是对象的模板或者模具，正如图1.10所示。类用来创建对象。
类可以认为是一种更高级别的数据类型。例如，你创建了一个整数或浮点数：
int x; float y;
你也可以使用预先定义的类创建一个对象：
myClassmyObject;
本例中，通过名称可以明显看出myClass是类，而myObject是对象。
请记住每个对象有自己的属性（数据）和行为（函数或惯例）。类定义了使用该类创建的所有对象具有的属性和行为。类是一块代码。从类实例化的对象可以单独分发，也可以作为程序库的一部分进行分发。因为对象从类中创建，所以类必须定义对象的基础材料（即属性、行为和消息）。总之，在创建对象之前必须先设计一个类。
图1.10 类模板
例如，以下是对Person类的定义：
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.