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ABAP Objects in ABAP Release 7.40, SP08
Modification
Optional Interface Methods
The new addition DEFAULT
of the statements METHODS and
CLASS-METHODS can be used to make general methods, functional methods, plus event handlers of
interfaces optional. An optional
interface method does not need to be implemented explicitly in a class when an interface is implemented.
Instead, a default behavior is specified for calls of non-implemented methods in the definition.
DEFAULT IGNORE calls an empty method and DEFAULT FAIL raises an exception.