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FlyWeightFactory is responsible for creating and managing meta-units. When a client requests, the factory needs to check whether there are eligible objects in the current object pool. If so, it returns the existing object. If not, it creates a new object. FlyWeight is a superclass. When it comes to shared pools, It is easy to think of JDBC connection pooling in Java, Considering the characteristics of each connection, It is not difficult for us to sum up: Applies to several objects that are shared, They have some common attributes, Take the database connection pool as an example, url, driverClassName, username, password and dbname, these attributes are the same for each connection, so it is suitable to use the meta-sharing mode to process, build a factory class, take the above similar attributes as internal data and the others as external data, and pass them in as parameters when calling methods, thus saving space and reducing the number of instances.Advantages and Disadvantages of 2 Events轻易也不能拿出八万两银子来。《狐狸新娘星》（剧本：姜银庆，导演：申宇哲）讲述了带着创伤与缺憾，在仁川机场相遇的李修延和韩夏天，与路过仁川机场的人们发生相遇冲撞的故事。是一部令人感动的人情浪漫成长剧。李帝勋饰演从KAIST毕业后，凭借不寻常的阅历和托业满分进入仁川机场的李修延，他以只以6个月适应这里的生活为目标来到仁川机场，是与周围人都保持着适当距离的神秘人物。蔡秀彬饰演带着梦想来到仁川机场的韩夏天，虽然每日都看着飞机起降，但本人却从未乘坐过飞机。经过三次终于被仁川机场录取，但在发生意外事故后背负着“人类炸弹”的角色，被派遣到了最为繁忙的旅客服务小组。李东健将饰演具有柔韧亲和领导力的资深运营企划组长徐仁宇，他是善于为人处世的高手，比任何人都更快进阶的仁川机场年轻掌权人士之一。金智秀担任仁川机场旅客服务部门旅客服务组长杨舒君，是能在危机面前也堂堂正正站在顾客面前的热血女狂人，是引领李修延与韩夏天职场生活的人物。Civil aviation pilots are the main force in the civil aviation industry. The clothes of civil aviation pilots are white shirts in summer and black suits in winter. The colors are basically uniform all over the world, but the styles are formulated by various companies, and each company is not the same. Civil aviation pilots are roughly divided into two grades: the captain and the co-pilot, but the captain and the co-pilot are divided into many grades. The co-pilot is generally divided into the first-stage co-pilot (F1), the second-stage co-pilot (F2), the third-stage co-pilot (F3), the fourth-stage co-pilot (F4) and the left-seat co-pilot (FL). The captain is divided into the captain, the teacher, the inspector, etc.真是义士无双。