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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.A collection of children's horror stories by R.L. Stine.照这位学生所言，本王只娶一个媳妇不对。我们去葬了孙婆婆。秦淼道：这就好了。讲述在1862年，热气球驾驶员Amelia Wren和科学家James Glaisher踏上了一段非凡的旅程，去寻找天堂的奥秘。在飞行过程中，他们的飞行高度突破了世界纪录，也有了令人惊叹的发现。然而当他们即将达到大气层时，被迫为了生存而展开史诗般的斗争。