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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.Out-of-the-box test.Analysis: It mainly lies in retaining the plus and minus signs. The result is NaN, but note that NaN is not equal to all values, including itself.Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:女人会撒娇，就能为自己和家人带来福气，不只一生好命，身边的鸡犬也跟著升天。相反的，女人嘴巴太臭太刻薄，下场不是家破人亡，就是孤苦病夭。如果人生是咖啡，撒娇就像糖，糖太少了太苦，太多了又令人反胃。世间的高EQ高智慧女人，都懂得撒娇要撒得恰到好处，也懂得自己的命运，其实都掌握在自己脑袋和嘴巴里。爱碎碎念咄咄逼人的女人们，赶快醒醒吧！当下放掉骂死人的机关枪和电锯，就能立地成「撒娇好命女」，一生贵人无数，人见人爱好运到。动荡乱世敌我难分屡获殊荣的《大西洋帝国》（Boardwalk Empire）第三季将于北京时间9月17日播出，本季为12集。《大西洋帝国》再现了美国禁酒令时期（1920-1933年）大西洋城这个海滨小城阴暗面的生存状况。《大西洋帝国》的编剧是《黑道家族》的编剧特伦斯·温特，该剧根据作家Nelson Johnson的原著《海滨帝国：大西洋城的诞生，鼎盛以及堕落》(Boardwalk Empire:The Birth, High Times and Corruption of Atlantic City)改编。