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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.穿越时空系列剧由东方飞云影视公司投资拍摄，已于7月16日在辽宁卫视王刚讲故事播出。系列分集：第一部 《穿越时空之明月郡主》； 第二部 《穿越时空之灵格格》；第三部 《穿越时空之大清宫祠》；第四部 《穿越时空之来客》。Operation: Plug in the power supply of the mobile phone-ensure the normal operation of iTunes-hold down the volume reduction key on the left side of the mobile phone while holding down the hand mechanism-hold down the two keys for 10 seconds at the same time-release the power supply key, but continue to press the volume reduction key for 5 seconds. If the screen remains black, congratulations, it's done! Your iPhone7Plus has entered DFU mode.即便是救不了九江国，也至少也救救姐姐和姐夫，还有您的外孙。何心隐自然是个极要面子的人，虽然他知道自己肯定留下，但总要有个体面的职位，如果仅仅是个小幕僚那就算了。回咸阳等死是肯定不可能的，除非是章邯是个傻子。　　危难之间，空军涌现了一大批充满斗志的年轻飞行员——高云天、刘长岭。在一次次的空战中，他们以弱胜强，用不屈的斗志和日本空军进行殊死搏斗。一寸山河一寸血，然而就在这样恶劣的环境下，有一丛爱火悄然燃烧。飞行中队长刘长岭爱上了情报处的马昕蓝上尉。然而他不知道马昕蓝是个中共地下党。