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Console.log (a.getName ()); //aa讲述了一个人称“鬼马人精”的贫困山区县委书记以“乌纱帽”作抵押，“敢为天下先”，超常规改变地方贫穷落后处境的故事，生动地诠释了邓小平“发展才是硬道理”的理论。连黄夫人也过来跟郑氏寒暄，一副熟人相遇的模样，半点隔阂也无，让郑氏十分佩服。……喂，是武界出版社吗？《白发魔女传》的后续剧情是什么？天启是谁？想知道后续剧情，请期待下一期的《武侠世界》。? Set the methods in the above multiple factory method modes to static, and call them directly without creating instances.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).