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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.该剧主要讲述了没钱、没爱情、没福气的“三无”普通主妇沈在福的女强人故事。一位年轻的父亲为了筹钱医治自己病重的爱女，又要不到拖欠的赔款，被迫铤而走险绑架了老板的女儿。然而他不知道的是，在这座幽静的山里，还有其他人带着不同的目的和欲望参与了这件事情，一座山上、一日之内、六组人马，各自的贪念在错综复杂的因果之下，逐渐失控，转向不可预知的方向。罪恶之中，谁能逃脱命运的审判？DDos attacks are often used in many ways, such as SYN Flood, DNS query, ICMP Flood, UDP Flood, and so on. This paper describes the common attack methods from the perspective of DDOS attack resources　　耿殿君率十三省潜入肇源地区，他们明里周旋于鬼子汉奸和土匪之间，暗里却与他们展开了殊死的搏斗。他们夺粮库，炸机场，打伏击，神出鬼没昼夜行动，他们壮大了力量，从隐蔽战斗直至大打明仗。一支勇悍的抗日武装在日关东军集结重地闹得天翻地覆,令鬼子失魂落魄。板栗见大势已成，反而不着急杀敌了，四处寻找秦淼他们两个。