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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.继母因无力负担生活，将苏菲和她的两个姐姐都送到了制帽店去当学徒。两个姐姐很快先后就离开了制帽店去追寻各自的梦想，只有苏菲坚持了下来。一天，小镇旁边来了一座移动堡垒，传说堡垒的主人哈尔专吸取年青姑娘的灵魂，所以小镇的姑娘都不敢靠近。该剧以1970年代大邱为背景讲述玩具工厂家的二女儿李正熙主人公和朋友们一起渡过的波澜壮阔的青春期故事。绍给朋友们，哄闹声中陈重抬头，发现站在面前的竟然是叶梅！/glad (happy)然而，环伊吕波，却忘记了自己的愿望。