August 2021
Intermediate to advanced
450 pages
4h 46m
Chinese
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3.3 作用域的重要性
单个类可以实例化出多个对象。每个对象有唯一的标识和状态。这点很关键。每个被单独构造的对象会被分配独立的内存。然而，一个类实例化的多个对象可以共享类中一些属性和方法，即共享为这些属性和方法分配的内存。
共享方法
构造函数是一个被类的所有实例共享的方法，这是共享方法的一个好例子。
方法代表了对象的行为，属性代表了对象的状态。对象有三种属性：
·局部属性
·对象属性
·类属性
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