It is implemented as a singleton class.
它是一个单实例类。
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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