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少年差点没一头栽倒，面色古怪地看着香儿。大娘乐呵呵地说道：不蒙你。The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.It is mainly used to reduce the number of objects created to reduce memory footprint and improve performance. This type of design pattern belongs to structural pattern, which provides a way to reduce the number of objects and thus improve the object structure required by application.