The API is straightforward: You call a singleton method and get back a connection object.
API很直观:您调用单个方法,并返回一个连接对象。
The DefaultDAO class stores an instance of itself (as a Singleton) in the static variable instance, allowing access to that instance through the getInstance() method.
DefaultDAO 类在静态变量 instance 中存储了它自己的一个实例(存储为 Singleton),并允许通过 getInstance() 方法访问该实例。
The static getInstance method contains the template code for a singleton.
静态 getInstance 方法包含单例的模板代码。
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