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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.正想着，忽听老嬷嬷说道：要说下塘集这地方，山水美，百姓也淳朴，怪道老宰相要在这里办书院。可是好景不长，没有过多长时间，韩信竟然又回来了，噩梦再次开始了。陈广陵原本家境殷实，其父早逝却不学无术整日与江湖骗子大头文鬼混，茅山派掌门派大弟子祁秀美企图加害潘馗。被龙虎山掌门凌啸天得知消息，命侄女凌彩月下山，欲联同其师兄潘馗除魔，没料到二人性格不合，时生争执，屡误大事，岂料彩月与潘馗徒弟陈广陵二人暗生情愫。Parachuting, powered parachute, traction parachute, gliding (paragliding, gliding, hanging gliding), hot air balloon, light aircraft; Swimming (fin swimming), sailing (windsurfing), rafting, surfing, diving, airships, sports yachts, motorboats; Mountaineering, rock climbing, bungee jumping, exploration, cars, motorcycles; Archery, shooting, crossbow