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Re-understanding OO: Object-oriented programming is an idea to think about software design structure with object-oriented thinking, thus strengthening the object-oriented programming paradigm. Object-oriented features are encapsulation, inheritance and polymorphism. "Do these count?" . So from that beginning, when I design a class, I keep reminding myself of the following three points:Attacks from outsideFor example, some common outsourcing companies receive a project, Then the received project may be the person in charge of the project or the manager level of the company. After receiving the project, the manager does not develop it himself. Leave it directly to the project manager for development, The project manager is certainly not willing to develop it himself. Oh, It will hand over the project to the following code farmers to do, So the coder handles it, If the code farmers don't handle it, Then the project may be directly suspended, but after the final completion, the outsourcing company does not know who developed that part of these projects. It does not know or care about it. What it cares about is that the project has been handed over to the outsourcing company and has been developed without any bugs. Therefore, the advantages of the responsibility chain mode lie here:However, there can only be one of these three drugs, and one of the ghost drugs and the explosive mushroom cannot be eaten if it is eaten first.下一本小说的精彩程度能超过《白发魔女传》四五倍？要知道《白发魔女传》集了旧派武侠的诸多优点，又加入了正义、尊严、爱民、爱情的元素，几乎开创了一个武侠新流派，很多读者都在大呼这是看过最精彩的武侠小说。该剧是根据1932年4月29日上海虹口公园日本天皇诞辰庆祝会大爆炸的真实事件改编。