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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.小葱恼羞成怒，瞪眼道：你再笑？我出来的时候，听外婆问娘，咱们家的表姐妹们，可有中意的，也要帮你说媳妇哩。一对情侣之间的磨合过程，究竟他们能否一起走向婚姻殿堂？To adjust the driving force, aileron, elevator, rudder, elevator tab or flap, see the following keyboard shortcuts.Go and see, won't be disappointed!In real life, Li Lei faced such a choice. In 2012, my father was diagnosed with advanced cancer. Until the last day of his father's life, Li Lei chose "active treatment".奥本海姆集团的精英房地产经纪人向洛杉矶的富裕买家出售奢华生活当一位新的代理人加入团队时，戏剧性的事件有所增加。by:mingtian6.com