Class methods and Object methods

Class method:

1> Plus + start

2> can only be called by Class (name)

Member variables cannot be accessed in the 3> class method

The benefits and applications of class methods

1> is not dependent on the object, the execution efficiency is high

2> can use class method, try to use class method

3> occasions: When you do not need to use a member variable inside the method, you can change to the class method

Object method:

1> minus-Start

2> can only be called by an object

The 3> object method can access the current object's member variables (instance variables)

Class methods and Object methods