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/nod (nod)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.张良看着刘邦点头，退了回去，眼神之中充满了期盼。赵文华兴奋望向杨长帆，从始至终都功不可没。男主是一位帅气、成熟稳重的农场主，凭借过人的头脑和精明能干的个性，把自己的农场打理得井井有条。女主是一位单纯漂亮、呆萌可爱的富家千金，虽然偶尔会有点小迷糊，但是她的天真善良吸引着身边的每一个人。这样两个原本完全不会有交集的人，却在未来的某一天，相遇了…PS: in addition, if that HTTP head returned by the Web site contain a P3P header, the browser will be allowed to send third-party cookies.Public class User1 extensions User {