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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.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.　　在一次表演过后，她们结识了更为年长的作家Melissa，以及她的丈夫Nick，一位帅气但沉默寡言的帅气演员。Mellisa对两人非常感兴趣，四人便开始了来往。40年代后期，洛杉矶有一片划归卡通动物族类居住的地区，称为“图恩城”。To be honest, after watching the scary panic, Made in China is really hanging. Please keep your eyes open and be careful.A create出现在眼前。精致的视觉效果，细腻和凶暴并存的纵