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Explain the template method mode, which means: in an abstract class, there is a main method, and then define 1... n methods, which can be abstract or actual methods, define a class, inherit the abstract class, override the abstract method, and realize the call to subclasses by calling the abstract class. First look at a diagram:Ab26776ab91b45ce9682e8bb6c522ba1翘儿其实也不想成为杨长帆的牵绊，最终只咬牙道：起码，等孩子出生了再走。每一次甜蜜的欢聚都让最后的分离痛得更加清晰。撕心裂肺的痛，终于煎熬出凄丽的爱情。尤佳期，大名广告公司业务经理，在一次新车推荐会上猝不及防地与初恋男友孟和平重逢。尘封已久的心骤起波澜，两人都发现对方在自己心中依然占据最重要的位置。然而和平的母亲肖云是横亘在两人之间一道不可逾越的冰峰。就在和平要违背母亲意愿与佳期再续前缘的时候，他最好的朋友阮正东(东子)却对佳期发动猛烈的爱情攻势，但他的攻势后面却深藏不可告人的秘密和深远的计划。东子是个富家子弟，也是大名广告公司的大客户，为人才华横溢，放荡不羁，身边女友不断。佳期对他避犹不及。阮正东的妹妹西子是电视台知名主持人，对孟和平芳心暗许，势利的肖云也希望和平能娶西子为妻，但和平心有所属，视西子为妹妹，令西子惆怅不已。因为业务关联，佳期不知不觉中与东子联络增多。被西子与和平误认为已经相恋。孟和平无法解开佳期心锁，又担心东子伤害佳期的感情，情绪低落通宵买醉，误将探望的西子当做佳期。佳期欲撮合静安与学长徐时峰，却不料两人早因争抢出租车“结怨”。静安痛击色魔Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.这会子汉王刘邦和麾下的诸多将帅谋士聚集一堂，他们现在正在考虑将来的打算。