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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.(4) Disclosing the business secrets of the client;We found that it was not very difficult to realize it ourselves, and Spring actually did so. In this way, IoC is actually an upgraded version of the factory model! Of course, to do a mature IoC framework, there is still a lot of detailed work to do. Spring not only provides a Java IoC framework that has become the industry standard, but also provides more powerful functions, so don't build wheels! If you want to know more about IoC implementation details, you may as well learn Spring's source code to deepen your understanding!In addition, 10,000 hours is not a promise that can be fulfilled. Some people misunderstand that one can definitely become a master after "10,000 hours". This is a misunderstanding. The real meaning is that all masters and masters must go through a long period of training and will not master XXX in 21 or 30 days. This is the difference between a necessary condition and a sufficient condition.　　崔贵华饰演姜浩俊，他是人权促进委员会的总管调查官也是检察厅外派的调查官，是一个集中力极强，以身体支配精神的行动派。周围人都认为他正义感爆棚且冲动，但他其实是一个脑子运转得比身体快的人物。他和冷静的搭档韩允书在性格上刚好互补。