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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.我张家当年也派了人去你们家问过了，当时你可没告诉他们这些。《血色恋情》主要讲述的是上个世纪三十年代的关东小镇，小女孩九红的父母被土匪黑心雕所杀成为孤儿，被好心的那班主收留。几年后漂亮泼辣的九红出落成闻名百里的“二人转”名角。一次偶然，鹏飞成为九红师弟，两人在朝夕相处中互生情愫。黑心雕是鹏飞生父，但作为一名爱国志士，鹏飞憎恨父亲的所作所为，与其划清了界限。当九红得知鹏飞是杀父仇人的儿子时，陷入了情与仇的深深挣扎之中……小镇蕴含丰富铀矿，日本特务慧子和大木等各方势力均觊觎此矿，一场血战由此展开。