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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.文明和饺子两兄弟自小隐居山林，与外世隔绝。义父死后，决意闯荡江湖，两个无知少年乌龙百出。后来两人进入秋山派，拜司马行空为师，大师兄达生平不被行空信任，故谋夺掌门之位，并对师妹宋婉儿只视作玩物，无心理会……Physically speaking, firewalls can be divided into hardware firewalls and software firewalls.朝夕相处二十多年的妹妹，是自己的亲生女儿；神出鬼没二十多年的匿名勒索，是自己的弟弟；尊敬倾慕二十多年的父亲，是自己的杀父仇人……一个悲苦的女人与几个男人离奇的情仇纠葛，首度犀利披露了家庭冷暴力的隐患！在距滨州市有二百公里的景南镇上，住着一户姓苏的外乡人家。他们是十年前才迁居到这里的，没有父母，只有兄弟姐妹三人一起生活。大姐叫苏雅琴，44岁。多年来，她总是接到一个自称是“陌生人”的男人打来的匿名电话，并以苏雅琴内心的秘密相威胁，向其勒索钱财，令苏雅琴惶惶不可终日。与此同时，也许正是因为她至今未婚的缘故，那上门提亲的人是络绎不绝。可是不知为什么，都会被她逐一挡了回去。大弟叫苏大明，年近30岁，文化程度只有初中……老琴师在归途中病倒在荒村渡口，渔家少年留老人在自己的茅舍里歇息，老人感到宽慰。翌日，老人病体康复，取出古琴，弹奏一曲，琴声把少年引到他的身边。少年学艺心切，老人诲人不倦，两人结为师徒。秋去春来，少年技艺大进，老人十分欣喜。但慰藉之余，思虑如何使弟子更上一层楼。一日，老人偶尔看到雏鹰离开母鹰独自展翅翱翔的情景，豁然开朗。于是携少年驾舟而去，经大川而登高山，壮美的大自然，使少年为之神往。临别时，老琴师将心爱的古琴赠送给他，然后独自走向山巅白云之间。少年遥望消失在茫茫山野中恩师的身影，顿时灵感突来，他盘坐在悬崖峭壁之上，手抚琴弦，弹奏着心之曲，倾吐着对人生的赞美，悠扬的琴声在山间回响