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3B) 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).最重要的是这位用兵如神的赵总兵，明明是工部出身，一旦掌权立刻显现出了可怕的军事才能，远在绍兴府指挥东线战事，旗开得胜，实是一位军政双全的奇才。Hold down the mouse wheel　　本片主要讲述了一群经常在池袋西口公园驻足的少年之间的故事。这群的少年是在池袋公园无所事事的太保，经常搭讪经过的高中女生，合拍的就一起去唱歌狂欢，看到不顺眼的人，就群起攻击。在警察和外人眼里，他们是十足的不良少年和社会渣滓。　　【以下为补充观点】看到许阿姨要给自己盛饭，陈启立刻站了起来，连忙说道：许阿姨，我自己来就好。