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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.[No Ring 365 Extreme Challenge Training Camp, Week 7, Day 1]洗脚城老板林东（梁家辉饰）是个好色的港商，时常找不同小姐满足生理需要。老婆王梅（金燕玲饰）不能生育，经营一家美容院，两人感情冷淡。青鸾公主见他回避自己的目光，面上更是呈现不忍的神情，没有高兴，反而更伤心了：果然，他并不是个坏人。改编自作者婉之的同名小说，由芒果TV出品，讲述了统计学专业的佛系女学生和带有强迫症的高智商教授之间的爱情故事。他见打他的人是小葱，立即跳脚嚷道：你这个母老虎。三皇治世。