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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.当务之急，便是安排好一切，护送越王安全返回山yīn。According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.When the program starts, empty and hide all, and when clicking on the stage, send out a broadcast:这能一样么？谁经历了富贵后，还愿意回到从前？况且，谁知皇上生气了，会不会下令将张家满门抄斩？********不要拍砖，相信原野是亲妈哈。讲述两个拉丁裔家庭争夺财富和权力的故事林聪沉下脸道：王管家凭什么说这里是山贼窝？难道不许人家防守家园了？他们又没有做什么坏事，谁让你们追杀他们的？受伤也是因为你们太轻率冒进。