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Online and off-duty classes: The curriculum system is relatively mature and the products cover a wide range of age groups, which has shown the trend of online development.白发老者不由的身躯一阵，一阵激动，立即转身眺望，眼中饱含着太多的期待。?Lins Concubine 091. It is obvious that the buttonWasPressed method violates the open-closed principle. Every time the state of light is added or modified, the code in the buttonWasPressed method needs to be changed, which makes buttonWasPressed a very unstable method.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.