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3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.2.1 AdvantagesPublic class Receiver {　　时值清初盛世，乾隆继承皇位。京城中有一个叫人闻风而丧胆的组织“血滴子”—身怀绝世本领的王磊，率领陈泰、胡图、穆森、十三、布喀等多名年轻高手，专门执行朝廷秘密任务，缉杀反清异己。在王磊指挥若定下，众人默契配合天衣无缝，每次以秘密兵器「血滴子」取敌首级有如探囊取物，执行过三百四十八趟任务依然从未失手。辉煌战绩令他们越来越自负，也令他们逐渐失去戒心。　　渴望城市生活的山里女人笋妹，不顾青梅竹马文春的劝留,毅然奔向了华丽的都市。而文春却独自在痛苦中挣扎。在时间的冲洗中,菊子踏入了文春的生活，在一次次独处中，他渐渐和菊子产生了感情。几年后,文春做了一村之长，落魄的笋妹回到了山里，因在外面的不轨行为导致了全村的排斥，自杀的想法不断在笋妹脑海里荡漾。几次被文春所救，慢慢地笋妹冲破了世俗的束缚，二人似乎又回到了当年……田遥被这番话震得头晕目眩，也终于明白了。