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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).《综艺大热门》，为三立都会台自2013年7月1日起首播的华人综艺节目，由吴宗宪、欧汉声、陈汉典、阿达、LULU主持。In any case, IT is an attractive business!Three years later, wages in Ma Jun tripled. "I spent the time I saved on my study. After three years of hard work, I got the CPA certificate." As for Zhang Meng, the salary has only increased by 800 yuan in three years. He regretted: "My eyes are too short-sighted."徐文长老远客客气气鞠躬，此为会稽百姓之福也。永仙大陆王朝众多，为强健体魄，延年益寿，这里的人们一直保持着仙武同修的传统，修行者一旦达到武道巅峰，便会问询仙道。少年苏禹，幼罹横祸，改名换姓，仍换来一场灰飞烟灭，却意外重生回少年时期。预知到家族即将败落，为保护家人和亲族，苏禹决定发奋图强，苦修前世习得的仙门秘法，历经艰辛，为结束悲剧，寻找外公一家冤案真相，不断奔波，一步一步改变命运。In the 2008 issue of Baby Behavior and Development, Professor Michelle Heron and VirginiaSlaughter described their experiment in which boys and girls of different ages classified cars and dolls of various shapes.