I. Overview
The prototype mode belongs to the object creation mode. By giving a prototype object to specify the type of object to be created, then create more types of objects with the method of copying this object.
Second, the structure
1, simple form
Client: Requests for creating objects
Prototype: Abstract role gives the interface required for all specific prototypes
ConcretePrototype: Copyable object
2, registration form
PrototypeManager: Create and record specific objects
Third, shallow cloning and deep cloning
Shallow Clon: Only the clone of the refrence level, the object refers to the object referred to in the refrence is not cloned
Deep cloning: Recursing the objects referred to in Refrence to consider cloning depth and cycle cloning problems
Four, motive
Factory method for complex grade structure
Five, advantages and disadvantages
1. Allow the dynamically increase or decrease the product class, and there is no impact on the entire existing product structure.
2, provide a simplified creation structure
3, the ability to dynamically load new features
4, the product class does not need to have a certain level structure
I, each class must be equipped with a cloning method
