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英王忙应道：谢父皇。Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?For example, some common outsourcing companies receive a project, Then the received project may be the person in charge of the project or the manager level of the company. After receiving the project, the manager does not develop it himself. Leave it directly to the project manager for development, The project manager is certainly not willing to develop it himself. Oh, It will hand over the project to the following code farmers to do, So the coder handles it, If the code farmers don't handle it, Then the project may be directly suspended, but after the final completion, the outsourcing company does not know who developed that part of these projects. It does not know or care about it. What it cares about is that the project has been handed over to the outsourcing company and has been developed without any bugs. Therefore, the advantages of the responsibility chain mode lie here:As for the conclusion, there is no pure text description here (even if it is described, it is very complicated, a lot of if). The "Android Development Art Exploration" gives 11 conclusions. Those who are interested can have a look. However, there are some text descriptions in the above figure, which can be taken as conclusions. They are mainly the two parts corresponding to the green arrows, which describe the final direction of each event. Each branch arrow in the figure is the condition under various circumstances.30岁的房产销售员国强本是个胸无大志、处事敷衍的男屌丝，却不料一次严重的失误将女友丽娜的努力付之一炬并为公司带来了巨大损失。此后更是麻烦不断，令身为同事的女友苦不堪言...