[23 Design Patterns] Prototype Pattern (5)

Preface In a software system, when the process of creating an instance of a class is expensive or complicated, and we need to create multiple instances of such a class, if we use the new operator to create such a class instance, this will Increase the complexity of creating classes and the coupling between the creation process and client code complexity. If the factory model is used to create such instance objects, with the continuous increase of product classes, the number of subclasses will continue to increase, which will also lead to the increase of corresponding factory classes, and the maintenance code dimension will increase, because there are two types of products and factories. This dimension increases the complexity of the system, so it is not appropriate to use the factory pattern to encapsulate the class creation process here. Since each class instance is the same, the same refers to the same type, but the state parameters of each instance will be different, if the state value is also the same, it is meaningless, there is only one such object. When we need multiple instances of the same class, we can complete the creation by copying the original object. This…