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三人坐在一块大石上。Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.后边的项庄反驳道：如今赵国的形式已经很危急，巨鹿城随时可能被章邯攻破，若是再不救援，赵王怕是撑不下去了。In Hunter's Notes, you can check the resistance of each weakness to different kinds of weapons (the resistance of weapons other than weaknesses is unknown)在第四季首播集创造了FX电视台20年来的最高收视后，《美国恐怖故事》获得了第五季续订在此之前的很长一段时间，这个安排并未发挥什么效果，现在是时候发挥效力了。