When a property is modified static when called class attributes, also called static properties
Class attribute: also known as static property
Object Properties: also known instance properties, non-static properties
If a property declared as class attributes, then all the objects, so a share value
There are two ways to access the class attributes
1. Object Class Properties
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2. Class Class Properties
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Both methods can access class properties, namely access and modify acquisition, but it is recommended to use the second class. Class attribute way to be, which is more in line with semantic understanding