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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因购物欲望强烈，方芳芳决定去看精神科医生，不想医生李简仁有选择恐惧症。看病过程中，护士早产，她协助保下母子平安，因此获得工作。方芳芳不久遇上一样患有购物狂症状的何穷富。方芳芳发现何穷富与李简仁都是香港大富豪，并且都约会她，她同时应答了。台湾富商公子薛海（罗志祥饰演）化名林达浪到杭州读书，与同学陈宝茱（杨丞琳饰演）发生了初恋，后两人因误会分开并失去联系，被抛弃的海变成一个玩弄感情的花花公子。三年后，海在电台节目中听到甜心的声音，遂买下电台并对其展开报复。期间，海发现自己竟仍然深爱甜心，于是重新展开对甜心的追求…7台kem&now新剧《男子汉之心》6月25日首播，周一周二档，该剧讲述了千金和四个保镖的故事。影片改编自真实故事，一群在少管所接受改造的问题少年们冲突不断，以雷公（林哲熹饰）和高少（纪言恺饰）为首的两派更是时常剑拔弩张，令王科长（连凯饰）很是头疼。直到新院长（萧蔷饰）到任，她希望用古典乐来教化这群问题少年，并特意聘请了乐团团长（金士杰饰）的女儿（程媛媛饰）担任音乐老师，于是这帮“坏小子”们开始了放下武器、举起乐器的乐团生活，直到一次大赛前夕……回头对出来，还以为咱们忒不会做人哩。刚才娘交代他们兄弟姊妹，不要过来打扰大姐姐和敬文哥。