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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.这个故事是关于一个在孤儿院长大的漫画家大树，他唯一知道的“温暖和快乐的感觉”是通过这封信。大树看见一只流浪猫，就把它带回家，但是有一天，那只猫变成了人。很明显，他来自“耳朵族”。阿淼已经把大树的无聊生活变成了混乱，但在混乱中，大树学会了真正的意义终于感受到了温暖和幸福的感觉~~改编自特雷西胡的BL漫画《喂,看見耳朵啦》私下追查无果，便搁下了。项豪廷（宋纬恩饰）和于希顾（黄隽智饰），前者是火，炙热高张得让人无法忽视它的存在；后者是水，透明无色的让人不知不觉中忘却它的存在。而原本毫无交集的两个人，却因为一个女人—李思妤（王真琳饰）而有了火爆的第一次接触。 『不打不相识』这五个字就是项豪廷和于希顾之间的写照！项豪廷也不知道自己是怎么了，他就是想再看于希顾发一次火，想再看一次情绪激昂的于希顾，而不是冷冷淡淡，仿佛一滩死水的于希顾，所以项豪廷想方设法的要挑起对方的情绪，做出许多幼稚的事情，只愿看到于希顾的笑容！这时项豪廷才发现，自己真正的心情。一个像来自北欧冰河的湖泊，一个像热带岛屿的太阳，我们的相遇，就像挑战这世上水火不容的定律，18岁的天空，只要牵着手，就能朝未来一直走下去在最平凡无奇的规律校园生活，遇上最好的那个你！郑氏低声对绿叶吩咐几句，绿叶便出去了，过一会就带着一个婆子，捧来了好些东西，有吃的，有玩的，还有一张毯子。Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.