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Method/Step 1This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,　　女儿小白意外撞见妈妈和周叔叔拥抱在一起，小小年纪的她无法接受，告诉了爸爸，不想却挨了夏博文狠狠地一记耳光，小白更无法理解，从此，埋下了心理阴影……该剧讲述了俞秀莲为报家仇独身上京，在途中却屡次被仇家所害幸得李慕白多次相救并在他的帮助下报仇雪恨的故事。莫名其妙的冤仇这一直是他原来那个世界。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.