Differences between simple factory and factory methods

Simple factory mode .. it is to judge the class related to instantiation by determining the input parameters of the logic .. for the client. removed dependencies with specific products .. however, if a function class is added. you need to modify the factory class (such as adding judgment conditions ). this is not a good solution ..

 

But use the factory method class ... it is equivalent to creating a factory for each function class. the advantage is. each time you add a function class, you can add a factory class. instead, he decided to create a function class, but asked the factory subclass to decide which function class to instantiate. Function Method

The instantiation of a class is delayed to its subclass ..

Maybe the mind is not flexible: The design mode is clear here.