A brief discussion on factory design patterns

The factory design pattern is the most commonly used design pattern. It is very useful for defining a runtime interface for creating objects, providing the best way to create objects. The following article will give you a brief introduction to the factory design pattern. I hope it will be helpful to you.

The Factory design pattern is called a factory because it creates various types of objects without having to know what type of object it creates or how to create it; by using With factories, we can separate the creation of objects from the actual implementation.

The following are three common factory design patterns:

Simple factory pattern:Create a factory method, Based on the parameters passed in, the corresponding product object is generated.

Factory method pattern:Extract the factory into an interface or abstract class, and the specific products produced are determined by the subclass.

Abstract Factory Pattern:An interface provided for creating a set of related or interdependent objects without specifying their concrete classes. It is used to solve relatively complex problems and is suitable for the production of a series of high-volume objects.

Note:

For simple factory and factory method, the usage of the two is actually the same, if the classification and name of the product are determined , the quantity is relatively fixed, and it is recommended to use the simple factory mode.

When to use the factory design pattern?

The factory design pattern is usually used in the following situations:

● The class cannot predict the type of object that needs to be created in advance.

● A class requires its subclass to specify the objects it creates.

● When you want to localize logic to instantiate complex objects.

Note:The factory pattern is a good solution for situations where the main part of the application requires managing objects rather than creating them.

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