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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).季木霖俯身把徐风挡在脸上的靠垫撤走，果然见他双眼紧闭、堵着耳朵。胡一八与王胖子是大学同学，他们为了女神杨子怡来北京做北漂一族。因为没有钱，二人选择在天桥上给人看风水算命骗钱，王胖子给胡一八当托儿，被路人识破，胡一八与王胖子为此大吵一架。就在两人绝望之时，一位神色匆匆的老太太找到两人，表示愿意出钱请胡一八帮忙驱鬼。感谢朋友们的打赏和粉红，祝端午愉快。也不缝衣，也不做鞋，脚上垫着脚炉，神情甚是自在。不想。