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The ICalculator in the figure provides the agreed method,想毕，小娃儿乖乖地说道：知道了。你前两次太辛苦，又受过伤，故而本将不忍派你前去。《摩斯探长前传》第八季已经获得预订，共3集，预计2021年播出。本季过后，该剧总集数将与牛津探案系列剧的另外两部《摩斯探长》和《刘易斯探案》一样达到33集。Key Issues Faced by Offline Organizations:During this period, due to changes in nerve sensation and metabolism, some people may produce some "strange" sensations. For example, ketone bodies produced by fat decomposition may make people feel a mild sense of excitement. Even if you don't eat continuously, you won't feel hungry or thirsty. Therefore, you won't feel pain because you don't eat.The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.