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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陶乐生性怯懦，常被同事欺负，叶语彤常常为她解围。陶乐对叶语彤心存感激。陶父好赌，常常欠了一屁股债而需要陶乐的祖母帮他解决，也因为常常到云顶赌博，陶大成在马来西亚有了另一头家。陶乐10岁那年，陶大成又欠下了一笔为数不小的赌债，陶乐的祖母狠下心要陶大成自己解决。想不到陶大成居然偷偷把“陶家庄”卖了，还间接害死了陶乐的生母。陶乐由祖母一手带大，而陶大成则把马来西亚的妻儿—杨丽丽和陶喜接了过来。在大学念书的陶喜虽然是陶乐同父异母的弟弟，但是两人的感情却十分要好。陶喜在大学里颇受到女生欢迎，但却迟迟没交女友。原来陶喜心里喜欢的是叶语彤。可惜叶语彤已经有了个男友汪友仁，陶喜唯有把这份心意埋在心底。叶语彤在厨艺方面比陶乐有天分，但性格急功近利。叶语彤在单亲家庭长大，父亲在她16岁时心脏病去世。叶父过世后，她变得叛逆冷漠。余灵芝聪明独立，但是性格急躁。余灵芝有很多追求者，她也乐于周旋其中。余灵芝有个大男人主义的上司－胡应邦，两人常常发生冲突。汪学仁向陶乐示爱被拒，调拨叶和陶之间关系，多年的友情从此决裂。After the ViewGroup receives the MotionEvent, it distributes the event according to the event distribution mechanism.: This attribute needs to configure the value of taskAffinity in the AndroidManifest.xml file of the target activity to be started "must be different from the package name of the startActivity sender activity, and taskAffinity can be omitted if jumping to another App", which will press the activity into the taskAffinity where the newly marked Affinity exists.每每心里不畅快的时候，我就对着天空和山峰大喊，然后回想起走过的山山水水，觉得自己就像芥子一样小，为一点事生气好无聊、好可笑。Lin Junxian Spokesman: 500,000 Wu Dawei Spokesman Every 3 Years: 500,000 (Print) Wen/Peninsula Reporter Xing Chengbotu/Peninsula Reporter Xia Nan Every 2 Years奔跑吧女孩 -- 周子琰