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4) If different applications share the same hardware server, the version problems of the basic environment will interfere with each other, and they all need to be specially modified for configuration processing, such as java version, python version, time zone, locale, etc.118. X.X.101The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.1. The ship at anchor shall show where it is most visible:Chapter III Signal Lights and Signal TypesIt should be noted that I am not proficient in DDOS and never thought I would be the target of attack. After the attack, many unknown friends provided all kinds of help and suggestions, which made me learn a lot. Here are some of the solutions that are most helpful to me.Update: I started the class ~ click on the link: three months to teach you how to start artificial intelligence from scratch! ! In-depth study essence practice course (free) can see my course, explained by Tensorflow, updated one class hour every day ~