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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 Encyclopedia陆家一家三口人都面临考试。儿子陆敏要考高中，父母要求他上重点高中，他紧张得像是得了“考试综合症”。 爸爸陆大义下岗了，也要去考试，考汽车驾驶执照。他第一次考试没有通过。 妈妈萧芳芳热衷于参加各种有奖竞猜活动。高考落榜的文艺少年杨风（张朔祯饰）梦想成为一个“嬉皮士”浪子，并誓要在毕业旅行中完成自己的浪子清单：打架、泡妞、吸烟喝酒、打坐冥想、和摇滚歌手交朋友……他在好友陈火（赵一凡饰）的相助下伪装成“逍遥骑士”，想借助漂亮师姐思思（安紫依饰）完成自己的“破处之旅”，却没想到思思也暗藏自己的“少女成人计划”，“逍遥路上”演绎啼笑皆非的动人故事。汪直绝望的面容并未泛出太大的波澜，只点了点头，示意自己听到了。那么，就是玄武将军了。尹旭回头看了一眼，嘴角微微一动，轻叹一声没有说话。Sichuan Artist Graphic Endorsement Company