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步兵自然而然不是骑兵的对手，来自草原的战马将齐军冲散了七零八落，不时有齐国士兵被踩踏于马蹄之下，环首刀自上而下的砍劈，无数的人的肢体在鲜血飞溅中断裂开来，情况相当的惨烈。? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?即便说了什么活着做了什么让霸王您不满意，您也该容忍才是。点击一下发布，书友们立刻就能看到。秦军纵有斥候哨骑探查，也难有所及，因而这绝对是一大优势。The main purpose is to save a state of an object, In order to restore the object at an appropriate time, I think it is more vivid to call the backup mode. Generally speaking, assuming that there are various attributes in the original class A and A, A can decide the attributes to be backed up, memo class B is used to store some internal states of A, and class C is used to store memos and can only store, not modify and other operations. Make a picture to analyze it: