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This article introduces the relevant knowledge of "what is the structure of prototype pattern?". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Structure

According to UML's rules, prototype should be written on the side of the Prototype class, which is a common fault in the book Design patterns. You should pay attention to it when you draw your own design pattern class diagram.

Participant

Prototype (Graphic)

-declares an interface for cloning itself.

ConcretePrototype (Staff, WholeNote, HalfNote)

-implement an operation to clone itself.

Client (GraphicTool)

-Let a prototype clone itself to create a new object.

If you compare it with the previous class diagram in the motivation section, you will find that the structure here is much simpler, which is simply a sentence: the base class declares an interface that clones itself, and then derives the class to implement it. As for the customer class, it always has to exist, not to mention (remember).

Cooperative work

The customer requests a prototype to clone itself.

All that's left is for the customer to call the interface.

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