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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.NBC已续订《芝加哥警署》第三季。人见人爱的聪明女白领本来有个稳定的男朋友，谁知就在庆祝升职的当晚……什么？竟然有个和我长得一模一样的女孩！她还救了我！……我为了感谢女孩给了自己的名片……谁知“双面名媛”出现了……一方面是希望田荣与项羽开战，试图报当年宋义被杀之仇，二来田荣现在也是被逼到了绝境，三叔希望通过他来逆转。王尚书也一怔道：白大人想见皇上？白凡点头，看了板栗一眼道：当年张家被抄，全家流放，是玄武王和白虎公凭着战功为张家挣得平反机会。System.out.println (name + "deal! ");