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Chap蔡辰逸和Green林亦乐领衔主演的泰国现代剧后来我每个月收了果子，就特意留着，准备托医学院的人带去给你们吃的。爹的话你都敢不听了？你伤才好，哪里能上阵杀敌？葫芦点头道：这一回，儿子一定不会听爹的。8-1 Message: Write a function called display_message (), which prints a sentence indicating what you learned in this chapter. Call this function to confirm that the displayed message is correct. ?The third category: the status of the class.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).