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> EMPTY methodsA method can be declared as empty. Empty methods are extensible. An empty method is very similar to an abstract method, in that it is a hook for functionality that can be provided in later extensions. However, empty methods are concrete and can be called. If they have not been extended (i.e., implemented), .Empty methods represent optional interfaces. For example, a BlackBox Component Framework View provides an empty method for handling user events (HandleCtrlMsg). This method is implemented in interactive views, passive views ignore it.It is not possible to introduce code in an empty procedure. For this reason, an empty method has no corresponding procedure body, and  via super calls.