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Know the principle man: Very good, your experience value has improved a lot. However, we can't start fighting monsters yet. After all, no monster can be directly sprayed to death. You lack tools. Then at this stage, we need to strengthen our programming ability. First find a framework to come down, read the source code, what? You said you can't read the source code, it doesn't matter, there are a lot of experience reading the source code online. Of course, the basis of these experiences is without exception: read more and write more. On this basis, find trick again. After the source code of the framework is set down, change some codes to run, debug them, and then constantly find out the reason to see how each API is written, and try to write it yourself. Write more and practice more. After 30 years of hard coding, you will definitely get something.In this book, Eriksson also mentioned when refuting the 10,000-hour law:这不好说。剧情聚焦军旅中的“人犬情”，围绕一群军旅战士和他们骁勇善战的军犬而展开，既有同类影视作品中血气方刚的烈性，也有柔情动人的细腻情感，更有令人忍俊不禁的喜感。 一次危险的边境伏击，将养猪班长郭油子和四只小野狗送进了塞外的军犬收养连。小野狗“步枪”、“小米”、“沧海”和“滔滔”在艰苦卓绝的环境中克服种种困难，出色地完成了各种任务，却因为有狼性血统而无法获得军犬资格，险些被送进动物园，幸好某军犬基地及时发出调令，拯救了四犬。在军犬基地接受正规训练后，“步枪”等犬终于成为优秀军犬，在各类危险任务中屡建功勋，最终代表中国军犬参加世界军犬锦标赛，过关斩将加冕“犬王”。在一次任务中，“步枪”为救战友堕入悬崖，一年后，训导员们带着新繁育出的小犬们在“步枪”的坠崖处宣誓——永远守护祖国的疆土。Finally, we initialize the proxy object ProxyObj; Just call the method of sending flowers (sendGift) of the ProxyObj object.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.7