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21. Visitor ModeC. Non-conformities.Mobile PhoneState mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.最严重的就是我们撤退之后，他衔尾而追杀，或者在半道上截杀我们，那我们的损失将会十分严重。The third is to use the design pattern flexibly. Even if you don't need any specific pattern, you can design high-quality codes. No sword is better than a sword.