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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.大卫·豪勒（DavidHaller），X教授查尔斯的儿子，小时候就被诊断出患有人格分裂+精神分裂症，他一生大部分时间都是在精神病医院进进出出。而凡夫俗子的医生却把大卫的这种症状看作是医学界常见的精神疾病。实际上，大卫的这种“精神疾病”是一种超能力，由多重人格产生的超能力，他的每一重人格都拥有一种能力或特质，因而得名“大群”。另外，大卫的超能力，部分原因来自于遗传其父亲查尔斯的X基因，再加上寄生于其精神面中的变种人影王的影响，使得大卫的超能力得以觉醒。This.command = command;Washing resistance所以，玄武候与玄武将军的服饰应该用黑色。