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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.何永强走后，毛海峰才拉来了光头问道：这次去哪里？光头悄声道：澳门。众护卫急忙就要冲过去救人。杨长帆最终不忘扎针，要防的不是他们，而是九州萨摩国岛津氏，他们可是盯着这里很久了。4. Common DifficultiesAs a cinerary road fanatic, Xiao Bian's love for Nagoya subway is quite deep. Therefore, please come boldly and safely. Nagoya welcomes you wholeheartedly with all the subways.夜幕降临，小镇寂静祥和。不知从哪个角落，传来了倒计时的声音。少女璐娜跪坐在黑漆漆的房间内，头上戴着一个宇航员头盔，眼睛紧盯着电视屏幕中火箭发射直播。她对航空航天格外着迷，身为修鞋匠的父亲投其所好，连女儿的生日都专门特制了一双航天靴。父女俩志趣相投，共同朝着航天梦而努力。璐娜一天天长大，她的航天梦从未消失。她努力学习，刻苦训练，小有成就，却也遭受了更多的挫折。