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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).Updated January 30However, none of the small traders did so. "They just repeat it every day, paying interest for nine years."Illustration of Event Delivery Mechanism田荣更是气不打一处来，厉声追问道：下令让大军反扑的事情，是不是范文轲的主意？的。Operating System: Windows 7/8/10这一遭当真是捡到了一个神奇的宝贝，那会子还想着去找才女的，现在看来这一遭是必须要走了。