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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:临了又说不放心，这不是专门来羞人的么。在黑莽原还不觉得怎样，眼下瞧着实在可怜。In these aspects, "yes" and "no" are often inseparable. In some areas that already have strong strength, "researching and manufacturing high-end and high-quality products that represent the country's future competitiveness and establishing and perfecting a modern industrial system with distinctive features" are also the direction of Shanghai's efforts.(1) Application Form for the Establishment of Fire Protection Technical Service Branches;帶你遊走人際關係的邊緣，慘劇成因究竟係乜？ 人與人之間嘅疏離、冷漠、無視，一一成為幫兇！ 世界每一個角落，惡性循環不斷，人類幾時先肯改過.为了保住饭碗，一名职场女强人必须前往克拉科夫。不料，怕狗的她却在此遇到一位迷人的鳏夫、他的儿子以及两人的狗狗密友