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杰·伊斯旺警探被派去调查一个养牛场的神秘失踪案。很快，杰伊的调查发现了一段过去的冤案，它威胁着整个社区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:DDoS Attack and Defense: From Principle to Practice (Part I)大人断案多年，当凭证据说话。他手上不过才堪堪不到两万人的兵力，他心里有些没底。The above contents are not used for commercial purposes. If intellectual property issues are involved, please contact Bo Weifeng Xiaobian (021-64471599-8017) and we will deal with them immediately./v oom-Insufficient mana.