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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.青梅竹马，相爱相杀，是冥冥中自有安排，还是一个愿打一个愿挨？来自离异家庭的少女林夕迟与傲娇自负的冰山射手许放风格迥异的人生，似乎注定要纠缠在一起。 因为童年时母亲缺席，林兮迟一直对这世界是否存在稳定不变的感情存有疑虑。而高冷少年许放，看着她从顽童长成少女，早已把给她稳 定不变的关系作为终身守护的目标。当林兮迟还没有搞清楚已进入省射击队的种子选手许放到底为何放弃去北京来到自己所在的蓉大，就再度进入了被虐模式。友达以上恋人未满的二人，很快因各自的出色分别成为学校焦点，却一再否认相爱的可能。林兮迟一直神经大条情窦不开，许放只能将一次次表白咽了回去，霸道毒舌变成亲近林兮迟的唯一方式。 在经历种种考验之后，林兮迟终于意识到许放对自己从始至终的陪伴和守候，才是全世界最珍贵的存在。而这一次，她决定，哪怕面对自己最恐惧的分离，她也要勇敢走下去，成为他最坚定的力量，陪伴他完成夺冠之路。《微信游戏：加个好友吧》是微信游戏自制的热门游戏最强搭档挑战综艺，节目汇聚英雄联盟、皇室战争、自走棋、和平精英、王者荣耀，微信小游戏等多款热门游戏。集合了全网48位顶级主播，12位知名艺人同台竞技，组队争夺最强游戏搭档，让你这一个盛夏欢乐不停！(1) After decoration problems, good responsibilityFor spoofing attacks, the first thing to consider is to choose the address. For the attack to succeed, the host on the spoofed IP address must not respond to any SYN-ACK packets sent to them. A very simple method that an attacker can use is to disguise only one source IP address, and this IP address will not respond to SYN-ACK packets, perhaps because there is no host on this IP address at all, or because some configuration has been made to the address or network properties of the host. Another option is to disguise many source addresses, and attackers will assume that hosts on some of these disguised addresses will not respond to SYN-ACK packets. To implement this method, you need to recycle the addresses on the list of source IP addresses that the server wants to connect to, or make the same modifications to hosts in a subnet.大苞谷听了他的话，哑口无言。故事的主人公朱小强是一个打不死的小强。曾经是一名优秀军人的他，执行任务受伤失忆后，回到了普通人的生活。但是他依然努力的工作，尽责的照顾家人，勇敢的面对自己。他为国家和家人付出一切无怨无悔，国家和亲人们也给予了他从物质到精神的无限关爱。最终他找回了自己的一切，又义无反顾的站在了对敌斗争的第一线。主人公作为和平年代中的退伍军人形象，体现了充满自我牺牲精神的援助人道主义精神，呈现了我国军警人员奋不顾身守护国民生命安全的决心，表达了主旋律、正义、铁血柔情等的主题。