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天底下哪还有这么好的镯子啊。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:Public interface Collection {1905年废科举，吴世泽满怀失落焚毁所有书笔纸张。萍水相逢的曹云婵救助了重病卧床的吴世泽。吴世泽在危难之际承担了胡氏墨庄的所有损失，并向遭胡家退婚的的曹云婵求婚，二人喜结连理。武昌起义改变了曹、吴两家的境遇。北洋军阀连年混战，宣城纸业的生产日渐凋敝。随着抗战爆发，曹、吴、胡、汪、诸葛几个在宣城举足轻重的家族的命运又被紧紧联系在一起。吴家长子吴舜仁与汪家长子汪斌走上两条不同道路。舜仁加入地下党，汪斌加入国民党，二人最终势成水火举枪相向。胡亦书堕落为日伪走狗陷害友人。抗战胜利前夕，曹云鹤为掩护吴世泽，与日军大佐同归于尽，彰显民族气节。解放战争中舜仁加入解放军南征北战，功勋卓著。Output:只见妇女立刻改变了状态和态度，一把抢过镯子揉了揉，然后看着杨长帆像看见亲儿子一样：哎呦诶。The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.