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AOP can encapsulate the logic or responsibilities (such as transaction processing, log management, authority control, etc.) that have nothing to do with the business but are jointly called by the business modules, which is convenient to reduce the repeated codes of the system, reduce the coupling degree between modules, and is conducive to future scalability and maintainability.B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).一群十几岁的孩子为生命而战，他们发现自己被困在一个有趣的房子里，被一个杀人小丑跟踪，直到最后一个都死了才肯休息。《无名英雄》拍摄于1978－1981年，是一部具有惊险片样式风格的革命英雄史诗巨作，是朝鲜电影史上最优秀的影片之一。该片由朝鲜著名导演刘浩孙执导，讲述了1952年末朝鲜战争的最关键时刻，朝鲜人民军把他们的王牌侦察员、《伦敦新闻》记者俞林派到汉城。俞林在这里碰到了他在剑桥的同学、南朝鲜陆军新闻处处长朴茂；遭遇了青年时代的恋人、已成为美军情报处中尉的顺姬；结识了南朝鲜极右翼军人头目申载旋。俞林以他的特殊身份周旋于汉城的各大权力集团之间，同美军谍报头目克劳斯进行了殊死的较量，不仅得到了各种重大情报，而且最终以他个人的方式推进了整个和平进程。算了，慢慢等吧。In the historical substitution principle, the methods of the subclass to the parent class should not be overridden or overloaded as far as possible. Because the parent class represents a well-defined structure, subclasses should not destroy it casually by interacting with the outside world through this standardized interface.(1) Height: 170-185 cm for men and 168-180 cm for women;