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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.#森川葵#主演的漫改剧《狂赌之渊·双》宣布杀青，将于2021年播出！Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below."Leaves dyed blue"杭州，真的没了。剧情简介：当青春遭遇海滩，那就等于是遭遇激情。因为在面对一望无际的大海，美丽的海滩时，年轻人们激情澎湃的胸怀就象喷发的火山一样全部迸发出来，也会引出无数美丽浪漫的爱情故事。让人难以忘怀的心动，回味一辈子的初吻，勇敢的挑战，伤心的离别，无奈的错过，没有预期的等待... 　　该剧描述了把自己的理想和爱情尽情的写在美丽海滩上的年轻人们的故事，将会是年轻人们浪漫热情的白皮书...大海，大山，华丽的海边度假村，能让你感受夏天的浪漫和激情。