Class methods and Object methods

Class method

1.+ can only be called with the class (name).

2. member variables (instance variables) cannot be accessed in a class method

class method use benefits and usage scenarios

1. Non-dependent on objects, high execution efficiency

2 can use class method to use class method as far as possible

3. Occasion: (You can change to a class method when you do not need to use the member variable inside the method)

You can allow class methods and object methods to call class methods in the name of an object method

Class methods and Object methods