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I am an ordinary international journalist of Xinhua News Agency. International journalists have never simply reported on what happened abroad. We observe from a Chinese perspective and grasp it from a Chinese standpoint. We use Chinese genes melted in our blood to express and spread Chinese voices well.只是这军队行走过的痕迹到底是怎么回事？向南就到了江边，渡江之后是江东。The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.Episode 25只要花无缺死了，这两兄弟就再也不用生死对决，兄弟相残了。Click on the green box of "Manaka" (the one-day ticket in the above picture is now updated to the 24-hour subway ticket, see the following subway ticket introduction for details)The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode: