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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.　　主角龙皓晨，为救母加入六大圣殿之一的骑士圣殿成为一名骑士，在一步步成长冒险中，奇遇，诡计，命运般的爱情与友情不断在他身上上演。龙皓晨坚守骑士精神，通过自己的人格与努力，赢得他人认可。他先是与六大圣殿其他天才少年组成“1号猎魔团”对抗魔族，为人类的生存与尊严奋战。同时不惜献出生命，守护自己的伙伴与最珍贵的爱人。而世界的局势变化难测，更多的阴谋在酝酿，更深的秘密也等着他却揭开。讲述拥有特异功能小人物冷钢赶走西方列强,一路成长的故事。　　女县长鞠萍率领的工作队正在夹皮沟开展土改，深夜遭到奶头山匪许大马棒的突袭。危难中通讯员白茹突出重围向牡丹江民主联军二团部求救，途中被进城买粮食的团部炊事员杨子荣所救……聊斋2有6个系列，《义犬》林静,陈浩民主演、《婴宁》六月,赵毅主演、《胭脂》韩雪,严宽主演、《罗刹海市》叶璇,孙耀威主演、《莲香》杨雪主演。林白笑了笑，露出一口雪白的牙齿。张家被抄家那会儿，咱靖国才打仗哩。