So p dot Cartesian is a kind of accessor, it's getting access to the data.
这就是为什么,我想要使用访问器的原因。
I think of data hiding as basically saying, one can only access instance values, or, we'll call them that, instance values through defined methods.
一个人仅仅可以访问实例变量,或者,我们可以这么来说,通过定义好的方法,来访问实例的变量。
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