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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.本作品是以Yamaya的漫画《不良少年君与白手杖女孩》为原作的爱情喜剧。弱视的盲人学校生？赤座优子和不良少年的故事？黑川森生相遇，描绘了他虽笨拙却互相吸引的样子。1996年，北海道道东。因一次不容错过的考试，美丽的女孩平泽纱枝（新垣结衣 饰）邂逅了阳光爽朗的男孩木内康平（生田斗真 饰）。不过这次相逢并不顺利，康平因驾驶汽车出了车祸延误了纱枝的考试，自己也被学校责令退学。糟糕的开始并非有一个糟糕的结局，康平与纱枝由此相知相恋，结为情侣。随着毕业的临近，他们的感情也面临着考验。康平继承家业，成为一名与大海搏斗的渔夫，纱枝则经过艰辛的备战，考上了东京的名府早稻田大学，时间和空间成为他们之间最大的障碍。在此期间，康平的家面临破产，生计举步维艰。纱枝也在求职的道路上不断受挫。两人的恋情似乎慢慢走向了消亡……注：第十集两集为一集，总计24集向着各自成长的青春关不能开。D) Practicality and skepticism. When looking at shallow reference books or looking up materials on the Internet, you should type (copy or copy) the code and run it yourself. You should modify other people's source code more and put forward your own opinions: why is the book not designed like this and why is it designed like that? What if you add some methods, method parameters, or member variables? You must do it yourself, at least run it. In addition, we should dare to ask questions and make bricks to bloggers. You can even question the commentary and intention of some chapters of GoF, not to mention some bloggers.