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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.动画第二季播出在即，从4月开始到7月，每周三17点与日本同步更新小剧场。Last updated on July 30, 2018Responsibility chain mode: pay attention to encapsulating object responsibilities, support changes in responsibilities, and realize transaction processing by dynamically constructing responsibility chains.Call for Strange Iron这就是传说中的“33分钟侦探”，5分钟能搞清楚的简单案件，鞍马六郎一定要撑足33分钟才能解决，到底是案件确有疑点，还是鞍马六郎故弄玄虚？充满搞笑与推理知识的《33分钟侦探》将为您解答。可是诸先生的动机和出发点是什么呢？难不成真是那日被自己的一番大义凛然给打动了？或者说还有些别的什么原因？尹旭的目光落到绿萝身上，想起当日诸先生询问的那些奇怪的问题，不禁有些狐疑。