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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).接着，她举了个例子，说有一回她跟葡萄忙对账，嘱咐苞谷在里间玩，不要出来捣乱。康纳邀请海沃思家族参加一场49人队的比赛，他正试图完成他的最新交易；汤姆有机会展示他的足球技术；丹尼斯试图让莎拉接受沙米娅对啦啦队的新兴趣。后有戚将军追兵，唯有向东退去。The fourth: singleInstance东东（吴昱翰 饰）是含着金汤匙出生的富家少爷，过着衣食无忧的生活，花不完的零用钱让他无需再工作岗位上奋斗，然而缺少了目标和理想的生活难免令他觉得味同爵蜡。三个性格迥异的男人，他们平静的生活因为一个名叫仙仙（刘晓洁 饰）的女孩的出现发生了翻天覆地的变化。"Liu Guiduo is very shrewd and more mature than us..."