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4 Easily implement revocation and redo of requests　　很快，天界魁拔司和地星神圣联盟均探测到了魁拔依然生还的“脉频”。因此，找到魁拔，彻底消灭魁拔，再一次成了各地热血勇士的终极目标。九国联盟就此发出征兵令，号召各地勇士参加联军，消灭魁拔。(2)到过去的下午(松田圣子 秋本奈绪美)Module usually refers to the code organization mechanism provided by programming language, which can be used to disassemble programs into independent and universal code units. The so-called modularization mainly solves many aspects such as code segmentation, scope isolation, dependency management between modules, and automatic packaging and processing when released to the production environment.趁着前辈们在座，也好教导你们一番。The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.