这样，您就可以知道当WeakReference或softreference类的get方法返回null时，就有一个对象被声明为finalizable，而且可能(不过不一定)被收集。

Therefore, you know that an object has been declared finalizable and possibly, but not necessarily, collected, when the get method of the WeakReference or SoftReference class returns null.

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在这个示例中，只用到了一个数据库，但在多数据库解决方案中，派生的业务对象类可以覆盖该方法，返回其适当的主要Notes数据库实例。

In this sample, only one database is used, but in a multiple database solution, the derived business object classes can override this method, returning their appropriate home Notes database instance.

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entities类的add_face方法在设计窗口中画出该平面，并返回一个face对象。

The add_face method of the Entities class both draws the surface in the design window and returns a face object.

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