Design pattern-Template method and state mode

1. Template method
Hook: In the abstract base class already has the default definition, the subclass chooses whether to overwrite it
In the template method pattern, the abstract base class uses the hook function (subclass depending on whether the case is overwritten) to achieve the purpose of controlling the flow control in the template method.
Design principles: The way high-level components treat lower components is "Don't call us, we'll call you"
2. State mode

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Design pattern-Template method and state mode