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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3.3.2 对象属性
在很多设计场景中，可以在同一个对象中的多个方法中共享属性。例如图3.6，从单个类中构造出了三个对象。请看以下代码：
图3.6 对象属性
注意该类中对属性count的声明是在方法method1和method2的作用域之外。然而它是在该类的作用域之内。因此，count对于method1和method2都是可见的（基本上该类中的所有方法都可以访问这个属性）。请注意两个方法中的代码都指定了count的值。整个对象只有一份count的副本，所以两个赋值行为操作的是内存中的同一份副本。然而不同的对象并不共享count的副本。
我们创建了三个Number类的实例副本来进行演示：
number1、number2和number3这三个对象都是单独构造的，而且都单独分配了自己的资源。整数count有三个独立的实例。当number1修改了自身的属性count时，不会影响对象number2和number3中的count副本。因此整数count是对象属性。
可以通过以下代码来理解作用域： ...
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