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I don't know whether it is the reason for setting or the reason for the program.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.身为珠宝经理的沈甜在爱情导师曼陀罗帮助下，听从冥冥中爱神的指引，寻找到真命天子，从此相信爱情，曼陀罗警告她绝对不能陷入脱单倒计时的爱情咒语。爱情咒语是遭到背叛，一定要在另一半结婚前脱单，否则找不到真爱。沈甜撞见男朋友李旦出轨，自觉应验爱情咒语。她必须在二十小时内前男友闪婚前，寻找到真爱。为了完成脱单，她找来闺蜜唐糖糖，两个人踏上脱单的爆笑之路，她根据脱单攻略来寻找真爱，却一次次失败收场。她到酒吧里去寻求脱单，遭到流氓骚扰，郑超从天而降，拯救了她，一系列求爱的举措令沈甜感觉遇到真爱，二人度过甜蜜一夜。她亲自送结婚珠宝到婚礼现场，珠宝被人调换，沈甜发现是真命天子偷了珠宝。原来一切都是爱情导师、郑超为首姐妹花诈骗团伙设的局。沈甜面对洗心革面的郑超选择了宽容。黎水已经欣喜地叫了起来：是周姑娘和冰儿。Public class MyVisitor implementations Visitor {202. X.X.16