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Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaSelect Custom GroupsThe reporter station also made a brief interview with Zhang Yange, executive editor-in-chief of Interface News. He said that Interface has prepared a bonus of 10 million this year, and there is no ceiling on the bonus for a single group (article) of articles.故事讲述的是公立高中的一年级生绫崎飒，因其父母性格懒散，使得他不得不每天都打工养家。圣诞夜，回到家中的绫崎飒发现父母留给他一张白条，原来，父母欠下了一亿五千万日圆债务后逃之夭夭。为了还债甚至还企图贩卖绫崎飒的器官。被黑道追杀走投无路的绫崎飒，妄图绑架附近公园的少女换取赎金，却阴差阳错的在层层误会之下，绫崎飒反倒成了少女的救命恩人。原来这位少女正是三千院财阀大小姐，为了报答救命之恩她雇用了绫崎飒当管家，并且偿还了他的债务。但是好人绫崎飒却坚持要偿还这笔钱，于是，绫崎飒的管家生活就此开始……他见方靖宇将家族产业打理的极有声色，遂多有褒奖，又见两个小的书读的好，就将他们送去京城，以备将来科举走仕途。回房换了衣裳，扮作个清秀少年，带上白果、虎子、黑娃，又命鲁三叫了几个护卫跟随，和三位哥哥坐车往清阳街去了。