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As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:小娃儿对于新环境十分满意，挨着墙壁趴好，两臂交叠，将下巴往上面一搁，眼一闭——再睡个回笼觉Action: Proud.In addition, there is a small mistake in the answer on the first floor. Spark and Moon Fire are both arcane.国际足球教练在庆功派对中不幸中毒镖毙命，手上的钻石戒指“粉红豹”也随之失踪。谋杀与失窃案迅速成为关注焦点。破案重任落到总探长德雷福斯(凯文·克莱恩 Kevin Kline 饰)肩上。无奈中，他想到了最佳破案人选——探员杰奎斯•克鲁索(史蒂夫·马丁 Steve Martin 饰)。临危受命的克劳索与总探长指派的木讷探员波顿(让·雷诺 Jean Reno 饰)组合成为一对儿“黄金搭档”。克劳索将教练女友歌坛天后仙妮娅(碧昂丝·诺尔斯 Beyoncé Knowles 饰)列为首要的嫌疑对象，谁知调查时却对她一见倾心。Alexa跳过沟渠，在奥克兰登陆。你猜怎么着？她的伙伴麦迪逊也敲门。当一名妇女在港口附近的近距离射杀一名陌生人时，这看起来像是一个开着又关着的案子。但一切都不像看上去的那样。一个男人无法克服自己的个人不安全感，导致他对任何事情都产生怀疑，而这也给他的妻子和儿子带来了极大困扰....