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The scenarios used in the command mode include: sometimes it is necessary to send a request to some objects, but I don't know who the recipient of the request is or what the operation of the request is. At this time, I hope to design the program code in a loosely coupled way; So that the request sender and the request receiver eliminate the coupling relationship in each other's codes.买好香槟和礼物，来到恋人处为他庆祝，对方却惊讶地发问你怎么又回来了？这是（安田成美饰）遭遇的困境，这世上有个和她相似的存在，并总是先她5分钟完成所有事。Firstly, the light program implementation without state mode is given:派陈平去？陈平倒是非常合适，口才与智谋绝对能够做到妥妥帖帖。For 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: 　CBS已续订《极品老妈》第四季。The advantages of monomer mode are: