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Singleton is a common design pattern. In Java applications, a singleton object can ensure that only one instance of the object exists in a JVM. This model has several advantages:号称“红魔”的雷蒙德（詹姆斯·斯派德 James Spader 饰）一直以来都是联邦调查局通缉名单上的“常驻人员”，某一日，这位控制了犯罪市场中大部分信息与资源的传奇人物突然现身自首，并且声称能够提供关于恐怖分子兰科（Jamie Jackson 饰）的最新线索，条件只有一个，那就是让初出茅庐的菜鸟探员莉兹（梅根·布恩 Megan Boone 饰）做他的搭档和联络员。　　北伐胜利加剧了蒋桂冯阎新军阀之间的矛盾。俞作柏决定联蒋倒桂，李明瑞率部前线倒戈，不可一世的新桂系顿时土崩瓦解。　　此段为石铸与佟林都怀疑潘媚娘的身份有假，便托麦青山以医治之名，试试她的脚是不是真瘸。林雁儿知道自己被怀疑，便设下苦肉计，要引出真正的金燕子……当真正金燕子海大娘中计，惨被就擒，并择日处决之际，铸竟发现雁儿乃海大娘之亲女……三大名捕聚首，不惜犯险以掩护忠良，究竟真假双燕能否化险为夷呢？It is found that many beginners of design patterns have some characteristics, that is, after learning a certain design pattern, they seem to understand it, but they do not know how to use these so-called elite experiences and suffer from not knowing how to start. When I first learned design patterns, I had similar experiences. I shared my experiences, hoping to be helpful to beginners.秦枫说皇帝又给葫芦赐了一门亲，郑长河开始也是大叫大嚷，一副不肯相让的模样。八月底，菊花黄……终于，书生带着人走了，屋子里恢复了安静。