How to use wall plug adapter mode:
Use a class to inherit the interface and the known class at the same time, and use the methods and attributes defined in the known class to realize the definition in the interface (mainly using the method of overloading interface methods). Use this class as the base class for other business classes, that is, this class adapts to the interface and known classes. If the known class changes, you only need to modify the class wall plug adapter to meet the implementation of the interface.
Wall plug adapter type: Needle adapter
