When copies of the singleton class run in multiple VMs, an instance is created for each machine.
当单例类的副本运行于多个虚拟机中时，每个虚拟机都会为其创建一个实例对象。
MockupDB, illustrated in Listing 3, is singleton class that simulates a database of customer orders.
清单3所示的MockupDB是个单体类，模拟客户订单的数据库。
The GameService class, in Listing 10, is a singleton class that represents the game server and the current state of the given game.
清单10中的gameservice类是一个单例类，代表给定游戏的游戏服务器和当前状态。
The component consists of a singleton class named PoIdGenerator, exposing a simple API, and responsible for managing blocks of POIDs.
这个组件由名为 PoIdGenerator 的单一类组成，它公开一个简单的API，并且负责管理POID 块。
These requests for a token are serviced by a singleton class named Dashboard, which manages the status of the endpoints of one or several groups.
获取令牌的请求由一个名为Dashboard的单态类进行处理，该类负责管理一个或多个组的端点的状态。
When would you use a class with static members and when would you use a Singleton class?
什么时候使用带有静态成员的类，什么时候使用单例？
Those who use it will find that they often have to write the same code each time they want to create a different Singleton class.
他们会发现每次他们要创建一个不同的单例类的时候，都不得不写同样得代码。
Those who use it will find that they often have to write the same code each time they want to create a different Singleton class.
他们会发现每次他们要创建一个不同的单例类的时候，都不得不写同样得代码。
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