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周菡被黎章了然的目光看得十分心虚，忙对他露出个大大的笑脸，再一次道别道：后会有期，如雷贯耳的黎将军。我真为现在年轻人的素质感到忧心。The core idea is: there is a Source class with a method to be adapted and Targetable when the target interface is used. Through the Adapter class, the function of Source is extended to Targetable. Look at the code:《神探夏洛克》的主创们将以全新视角为您演绎出世界上最著名的吸血鬼：华丽、阴郁、邪魅危险的德古拉伯爵…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:虽然未来充满警戒，但直斗诚实的话语给了我勇气，于是踏上了天神路上的演唱会。之后，直斗和只有SNS的对话开始了，即使不能见面也渐渐被对方吸引，与成长的未来斗。虽然未来会变得积极，但前男友再次受到威胁…However, not all objects are literally monomers, for example, if they simulate arrays or contain data, then they are not monomers, but if they organize a number of related attributes and methods together, then they may be monomers, so it depends on the developer's intention to write code.