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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.某天深夜，博爱医院的内科医生辛玉廷（马崇乐）和画匠老方救下一名被日本宪兵队追捕的伤员后，另一名医生周益（雷明）向外挂了一通神秘电话。不久，日本宪兵队特高课青木（袁春海）收到号称“帝国军人眼睛”的“四十五号”提供的情报，下令搜查博爱医院，翻译官丁彦（郭法曾）首当其冲搜查时，扑了空."四十五号”现身日本宪兵队，称周益就是要找的新四军的买药人，原来他是……知晓药品交易的时间和地点后，青木再派丁彦出发，殊不知丁彦同“四十五号”的身份并无差别。Your sketchpad is too smallYou see the false side of a man西安事变前夕，红军到达陕北，蒋介石欲将西安作为陪都考虑，西安一时成为全国的焦点城市，是中统、军统、中共、日本人、中央军、东北军、西北军各方情报特工人员争夺的前沿。为夺取解放胜利，共产党地下人员武仲明以孪生哥哥武伯英身份潜入西安。 武仲明刚到西安，便面临一场生死考验。办公室的新派女性黄秀玉对其疯狂示爱。而一直追求黄秀玉的特务科长胡汉良处处为难武仲明。更令武仲明意想不到的是，已经与哥哥离异的嫂子沈兰，竟然回到西安寻夫。特务头子齐北以联络官的身份赴西安党调处就职。危急关头，武仲明在沈兰和组织的帮助下，将危险一一化解，送出情报。The required simulator is shown in the figure