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? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?先说说北边的情况吧。然而某天，玉森遭遇不测，离开了这个世界，留下了一本没有完成的绘本。宫田希望这本绘本能够完成，于是寻找到了武田帮助自己。但其实玉森死后一直在守望着宫田，嫉妒心发作的他甚至希望把宫田带到死后的世界。毛小凤天生有种怪病，不能接近女色，进入大学之后跟损友一起偷看女老师洗澡，结果无意中开启“阴阳眼”。从此以后，毛小凤能够看见很多常人看不见的“东西”。校园里连发诡异死亡事件，毛小凤卷入其中，发现事情并不是表面呈现的这样简单。经过毛小凤的深入调查，他发现了这座大学院校的一个惊天秘密，而背后的黑手也在悄然伸向毛小凤...We know that computers can be used for work, study, entertainment, etc. In addition to the necessary computer hardware, software is also needed. Usually, we call a computer with only hardware but no software "bare metal", which cannot do any meaningful work. At present, software can be divided into two categories according to its use: system software and application software. System software is a program designed for computer systems to efficiently use and manage computer software and hardware resources and support the operation of application software. Such as operating systems, programming languages and language processing programs, network system software, system service programs, etc. Among them, Windows operating system is what we often use. Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, office XP, Photoshop, Red Alert and so on, which we often use.