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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).黄豆听了又是生气又是激动，忙问道：那狗官那么坏，咋舍得让你把这些东西都带走哩？红椒横眉道：不让带？他敢。行了行了。该剧讲述了三个从未谋面的平凡人，在一次危急情况下，联手化解危机，因此卷入一系列神秘案件，被警察和黑帮追杀的故事 。拿眼前来说，若高凡一行人真下了河，会在哪里上岸呢？他叫过大苞谷，跟他商议。这是一部以急速发展的中国IT产业为北京的当代都市情节剧，就读于清华大学的三个同窗好友彭力轩、易之迅、裴友明同为击剑部主将，人称“三剑客”，他们都爱上了教授的女儿米雪。 随着内心爱情的愈发深厚，三人的关系也都微妙起来。为了不影响他们的友谊，米雪无奈之下选择出国。暗藏心机的友明利用从米雪处得来的资料也出了国，并利用米雪一人在外的孤独感，取得了米雪的信任。 　　毕业几年后，各奔东西的三名好友都闯出了自己的一番天地，在有着中国硅谷之称的北京中关村，年轻的他们是名副其实的IT精英。刚刚归国担任美国维申公司驻中国区总裁的友明在给大家带来惊喜地同时宣布了他与米雪订婚的消息，使得力轩和之迅大为震惊。在失落和猜疑之中，又有两名性格迥异的女孩分别闯入了他们的生活；与此同时，伴随着误解、背叛、阴谋和爱情，惊心动魄的IT商战开始了。 　　三位昔日同窗，各自代表着国企、民营资本和跨国公司的利益，上演了一幕又一幕的恩怨纠葛。在友情与爱情、个人与国家之间，一次又一次地权衡挣扎，命运的天平最终会偏向哪一方？3. Due to the explosive force of weightlifting pedaling, the foot pressure is high, and the strength of simple shoelaces is slightly insufficient, magic straps are generally required to be fixed, and the vamp is mostly made of leather material, with few woven surface materials.