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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.警探肖恩和大卫·卡特正在调查这个案子，他们要追捕一名可怕的连环杀手，他正在这个城市制造恐怖。　　后来，红鱼因为无法面对李安的母亲和满腔痴情的赵秀，毅然舍弃三片金鳞，救活李安。复活后的李安雷厉风行，有红鱼相助，如虎添翼，二人联手为查明要案和余县的贪官、恶霸、土匪连番斗智斗勇，并最终除暴安良，保一方平安。For accelerated taxiing before takeoff, pressing the PAGE UP key will accelerate (just press it), whereas PAGE DOWN will slow down.杨长帆大笑，在他眼里，所谓何心隐，其实也不过如此：先生莫咒我英年早逝，请。徐文长虽然情绪很不稳定，但基本的判断还是有的。世界会变成什么样？灵犀阁最后一位阁主到底是谁？被释放的火领主会做什么？灵犀阁会怎么样？女王和黎灰会得到灵犀之力吗，时希封印解除，辛灵冰公主会回来吗？