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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:In the press release on the same day, there was also a passage like this: "Shanghai actively implemented the decision-making and deployment of the CPC Central Committee and the State Council, formulated and issued the" Three-Year Action Plan (2018-2020) to Accelerate the Progress of the "Made in Shanghai" Brand to a Global Excellence Manufacturing Base ", vigorously developed advanced manufacturing industries, and promoted the deep integration of the Internet, big data, artificial intelligence and the real economy. The two sides will take this signing as an opportunity to carry out all-round cooperation to jointly build an ecological chain gathering area for Shanghai's consumer electronics industry and a new high ground for innovative industries, thus boosting Shanghai to build a science and technology innovation center with global influence. "The first step to prevent DDOS is to have a backup website or at least a temporary home page. In case the production server goes offline, it can immediately switch to the backup website, so there is no way out.已经有不少商家和大户人家听说消息之后，趁着洪都的物价尚未暴涨之前，已经开始购置房产。Liu Yifei, Lin Junjie ~ ~ ~同时不得不感叹，越王当时是福泽深厚，一个个夫人美艳如花，还都有非常之能，福星高照。《猜心妙手》由香港名嘴吴忠宪、歌影明星陈小春以及漂亮女孩苗圃、新加坡明星范文芳领衔主演，是一部集古装时尚幽默悬疑于一身的电视剧，讲述了浪荡少年沈诓立志要当“猜心妙手”，与妻子紫云一起，经历了种种匪夷所思的离奇事件，逐一地替人解开心结，战胜心魔的故事。