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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.张小凡默默地修炼，默默地暗恋师姐，默默地在青云门里。FOX已续订《沉睡谷》第四季。概况上来看，雷（列维·施瑞博尔 Liev Schreiber 饰）是一个通俗的中年汉子，现实上，他从事着一份布满了刺激和危险的神秘工作——替上流社会的各路名人雅士解决他们“不克不及说的麻烦”。在客户们眼中，雷是无所不克不及的天主，可是雷呢，尽管解决过各类各样的“疑难杂症 ”，但他始终无法“治疗”本身的糊口。　　雷的父亲麦克（强·沃特 Jon Voight 饰）方才从牢狱里出来，他的家人和社会可以或许宽容的采取这个看起来有些玩世不恭的老头子吗？身为雷的老婆，艾比（葆拉·马尔科姆森 Paula Malcomson 饰）对于丈夫的事业和本身的身份又抱有着如何的思疑呢？Digestive system"Web Security" CSRF Attack and Defense, the First Defense Line for Web SecurityThe third child was most loved by his father and inherited his father's footsteps as a policeman. Jin Ideal, who graduated from the Police University, passed the prosecutor's examination but finally chose to be a police officer. I didn't expect that the first case I received was to go to a snack bar to persuade a couple to break up with each other. The heroine of the incident was a rich girl Zhu Yuying. Her boyfriend changed his mind and made a scene with her boyfriend in a nightclub. With the help of Jin Ideal, she successfully let her boyfriend finally walk into the street in his underwear.