Class method: also known as static methods
object method: also known as instance methods, non-static method
to access an object method, must be based on the premise that there is a target on
access class methods, there is not need to object directly access
And access class attributes , like calling a class method, there are two ways
1. Object Class Methods
2. Class Class Method
Both approaches can call the class method, but it is recommended to use the second kind. Class methods are the way, which is more in line with the understanding of semantics.
And in many cases, and no examples, such as when used in the previous practice of obtaining random numbers approach
random () is a class method, the class to be called directly by Math, Math exists and no instance.
If one method, the calling object properties, such as
The name attribute is the object attributes, only a specific object exists when, name makes sense. If the method in accessing the object properties, then this method, it must be designed as an object method