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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:One, what is DockerOf course, the cost of such DDOS attacks is not low, and ordinary websites will not have such treatment. However, what should I do if I really encounter it? Is there any fundamental prevention method?尉缭在秦朝做太尉时，是秦始皇统一六国进行中，以及刚刚统一六国的初期。“暴食”、“贪婪”、“懒惰”、“嫉妒”、“骄傲”、“淫欲”、“愤怒”，这是天主教教义所指的人性七宗罪。城市中发生的连坏杀人案，死者恰好都是犯有这些教义的人。凶手故弄玄虚的作案手法，令资深冷静的警员沙摩塞和血气方刚的新扎警员米尔斯都陷入了破案的谜团中。他们去图书馆研读但丁的《神曲》，企图从人间地狱的描绘中找到线索，最后从宗教文学哲学的世界中找到了凶手作案计划和手段的蛛丝马迹。凶手前来投案自首，这令众人都松了一口气，以为案件就此结束，怎料还是逃不出七宗罪的杀人逻辑，这次凶手瞄准的目标，是那个犯了“愤怒”罪的人……但是，那里有像在网上流传的杉泽村那样奇怪的废村，还有很多遗体！希望渺茫，不服输的麦昆能否重新取得胜利的荣光……