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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.作为老师的姜大雁（宋佳 饰）各方面条件都不错，可三十四岁了，依然孓身一人。大雁的婚姻一直没有着落成了姜家上下万分操心的问题。于是各种相亲和朋友介绍接踵而来。为了配合家人的好意，大雁参加了形形色色的相亲，见识了各色各样的人。在人海之中，也不是没有遇到合适的。遇到了一个各方面都还不错的公务员方泉（郭涛 饰）。本想进一步接触看看，可人家目的明确是为了更好的发展而选择结婚；弟媳这边的上司彭坦（周杰 饰）各方面条件都很好，为人也幽默风趣，但其母则严厉苛刻，于是也不了了之；电台主持人苏如是（刘德凯 饰）是大雁所教学生的家长，颇具成熟男人的魅力，很是吸引大雁。但为了女儿，苏如是还是选择了和前妻复合。大雁也只能无奈放手。王离也算不负祖、父名望，蒙恬死后便接掌了长城边军，肩负起镇守大秦帝国北部边疆的重任。三线作战，汉国如何能够承受的起？韩信也轻轻摇摇头：这样做恐怕有些问题。然，本王早在白虎将军还是乡野少年时，就已经将女儿许配与他。So it is even more difficult to lift weights and squat down.