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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.3. Take your above three certificates plus graduation certificate, ID card and physical examination, and you can sign up for the lecture-that is, "lecture".左掌是火门，右掌是燧石，扳机一开，弹簧出力，火石相撞。本片以上世纪六十年代的本地家庭为主轴，通过成员的际遇，带出早期的甘榜生活以及后来的组屋生活，剧情横跨数十年。季木霖看他一副发现新大陆的样子，无奈地摇了摇头。