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到了上面，两条烟道汇聚成一条。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.* Author: CNCERT, please indicate from FreeBuf.COM for reprinting在漫威的Cos大作《异人族》放完后，《神盾局特工》就将接棒回来。漫威在纽约漫展上宣布，《神盾局特工》第五季将于12月1日回归，美国时间当天晚上8点进行特别首映，从12月8日开始恢复晚9点放映时间。精通科技的10岁男孩Ryder在拯救了6条小狗之后，将他们训练成了一组本领高强的狗狗巡逻队。每个小狗都性格鲜明，也各有特长。不管遇到多么困难和危险的救援任务，他们还总是忘不了相互玩闹，制作轻松的气氛，而每次幽默乐观的狗狗能总能顺利完成任务。