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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).Writer: (///The following is the configuration I use. I have written out the CI that need to be modified. The CI that has not been changed will not be written out if the default value is used:他们三人也跟了过去，躲在窗外的一丛芭蕉后，既能听屋里的说话声，又能避免被远处巡查的军士看见。First the knockout round robin.Strategically speaking, it may not be a very smart choice to completely turn a blind eye to sharp deviations, especially when this situation occurs when positions are very concentrated. Of course, this may easily miss dozens of times the myth, but it can also avoid the risk of putting all your eggs in one basket. The degree between these choices is related to the basic expectation of investment, the choice of risks and profits, opportunity cost, etc.Methods: