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Coveting inferior shoes is cheap, resulting in foot damage.时空是可以穿越的吗，命运是可以掌握的吗？Representative Professions: Red Eye, Taidao Sword Soul, Male and Female Poison King, Female Roaming, Ghost Tears, etc.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.因为太美了，无法言语的美。简先生心中一跳，有些惊慌地问：为何？黎章淡然道：很简单。