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The first step is to encapsulate the policy object. The following code:声を聞かせて 加藤晴彦 林原めぐみ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 EncyclopediaThe landlord refuels不像有些游戏，人物造型粗制劣造，丑到没朋友。剧以身在南洋艰苦奋斗的热血儿女在革命精神的指引下，积极为了国内的革命事业出钱出力，最终在革命党人朱瑾(隋俊波 饰)的正确指引下全都积极投身革命事业，为新中国最终的伟大胜利做出了不可磨灭的贡献为内容核心，以黄圣依、佟大为饰演青梅竹马的恋人陶舒燕与简肇庆的凄美的爱情故事为主线。 　　剧中简肇庆从懵懂的少年，到与青梅竹马的恋人陶舒燕生离死别下南洋，而后陶舒燕为爱赴南洋寻简肇庆，正当二人久别重逢喜极而泣之际，却爆出两家祖上的恩怨世仇又使有情人却成劳燕分飞，后经两人情真意笃相思相守的冲破封建牢笼又有情人终成眷属，最终却因误会而演绎了一场罗密欧与朱丽叶的悲剧恋情。