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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.朕事后可是要跟严知府对证的。国公府的二少爷也喜欢她，闹得十分不堪。在亲人去世的感悟后,他毅然踏上了挽回幸福的旅程，因为他不想再失去一份跨越国界的亲情，一份超越国界的真爱。蒲俊道：取道韩、临江国时，两位并未有任何异动，至于西楚国边陲之地，项羽尚未派军驻防，可谓鞭长莫及。永平帝正想得出神，被这声音惊得汗毛乍竖，浑身一激灵，忙直起身子，紧张地问道：出了什么事？快快道来。When the process is reasonable, When contingency plans are adequate, It is time to show the real strength. Look at the recovery situation after the emergency. The main reference is that the business interruption time is generally less than 10min-15min, which depends on the importance of the business and cannot be determined in a word. Then there is the business recovery time. The shorter the recovery time, the simpler and more efficient the plan. Finally, there is the business recovery situation, and the corresponding business tests are directly carried out.