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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.(PS: The author's equipment, heart-to-heart drinking, sweeping and soul-settling are +1)尹旭的用心不可谓不毒辣啊。On the left are fake socks and on the right are real socks.此番回香溪镇，因为没有可以居住合适房屋，所以他们直接在香溪河边搭起了帐篷，倒显得很别致。I have a friend who used to be a stay-at-home mother. She couldn't stand a quarrelling marriage all day long and chose to divorce.巴蜀之战关系重大，对西南一带多有了解的武陵蛮首领云青山也赶了回来，同时带回来他出使巴蜀的最新消息。