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The above example is a fact verified by writing code. As for the reasons, it will be analyzed in detail in this article. Here, it is only to illustrate that the above points need to be considered.　　不知是上天开了个玩笑，还是小鬼作祟，她和他再一次不期而遇。"Yes, Common carnivores, Whether it's a dog, Wolf, or the dog teeth of lion and tiger, They are all tapered sections, With a tip in the front, But this kind of thing is different, All of their teeth are the same, All of them are inverted triangles, And very thin, Both sides are like knives, It was all 'open-edged'. It was very sharp and very hard. When I pried its mouth with a dagger at that time, after priing it open, I could find many thin but obvious scratches on the blade of the dagger in the face of the sun. The dagger I used was made of steel. It was really surprising to me that the teeth could leave such marks on it. "Zhao Mingkai said.本剧由韩寒的同名小说《三重门》改编而成。主人公林雨翔（吴禺男）自幼天资聪颖，活泼可爱，加上其父的影响，从小就被誉为“神童”。然而这个极具才气的少年却在实践严重偏科，也因此遇上了影响他一生的老师马德宝（黄燎原），还有占据他整个情感生活的女同学苏珊（董洁）。青春年少朝气蓬勃的他们，与所有同龄人一样有着情窦初开的情怀。有意无意的接触间，爱情的萌芽逐渐开花在这个恋爱的季节里，充满幻想的男孩女孩能否找到那把钥匙，去打开人生的门、心灵的门、爱情的门男校风云Note:----> The following represents what the event target needs to do.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.