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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).张槐虽然两年前在京城见过夫子，然记起当初被流放离开清南村时，夫子送的积善之家，必有余庆的赠语，依旧鼻头发酸，哽咽道：夫子，晚辈回来了。就没想到你们连衣裳都没有。该剧讲述了女主人公楚瑶与男主盛蔚阴差阳错相识，随着层层深入的了解，五年前一场惊天阴谋被揭开，离奇失踪的前男友，智力超群的绿眼白鲸都卷入其中，身处阴谋中心的两人，面对爱情、正义该如何抉择？海港市护城河的一起突如其来的离奇“浮尸案”，致使战功累累的刑警队长陆萧泥足深陷。嫌疑犯绰号“水鬼”，不但拥有极强的反侦察能力，更具备超出人类极限的潜水能力。陆萧与新搭档房一彤在追查“水鬼”的过程中历经波折，更失去了挚爱的未婚妻姜一然。正当陆萧迎来至暗时刻，看不见的杀手“水鬼”却波澜再起，他的下一个凶杀目标疑似号称海港市首富的企业家程丽君。陆萧唯有依靠强大的意志力、非凡的克制力与过人的智商和勇气，在房一彤的协助下，依靠支离破碎、毫无头绪的线索，逐步攻克这一起史无前例、错综复杂、迷雾重重的连环悬案。而在前方无尽黑暗中等待他的，将是一个凶残至极、无所不能的超级杀手。你怕什么？他陈离是真玉米，所以理直气壮。