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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.女朋友分手，工作被炒，周行文失魂落魄地走在街上。The solution is to move the cursor to the end of the article, then click "Page Layout"-Page Setup-Separator-Continuous "and confirm.刚才有人看见她出来，往这边来，想是去后院了。万万不可。所有事件都从血开始！ 为了正义而压抑自己的欲望的吸血鬼检察官闵泰延（延政勋饰）， 以无法停止对血的欲望而活的未知吸血鬼！ 本能地互相认出的两个吸血鬼， 为了自己的欲望和本能开始了互相追逐 无法逆转的命运的对决逐渐展开！天启……老师……周星河看着陈启，眼神有些闪躲，声音毫无底气。