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Iterative sub-patterns: Iterative sub-patterns can sequentially access elements in an aggregation without exposing the internal appearance of the aggregation. The aggregation of multiple objects is called aggregation. Aggregation objects are container objects that can contain a group of objects. Iterative subpatterns encapsulate iterative logic into a separate subobject, thus separating it from the aggregation itself. Iterative subpatterns simplify the aggregated interface. Each aggregated object can have one or more iterative subobjects, and the iterative states of each iterative subobject can be independent of each other. Iterative algorithms can be independent of aggregation role changes.Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.银行职员田中胆小懦弱没自信，常常受到同事和上司的白眼和训斥，有一天，他竟然收到了一把枪，这把枪给了田中心理上的支持，从此他就能挺直身板做人啦。（草なぎ剛、小日向文世饰）Someone asked a question in Zhihu: Is the gun in the TV series real?Club Friday原为一档电台节目，后改编成系列剧，多为真人真事。于是，小娃儿急忙跑去外面，用双手吃力地端了根小板凳进来送上。