The interface object itself does not contain any code, only signatures, and cannot itself be called from code, but must be implemented by other objects. With the new AL language version, you can use the new interface object to declare an interface name along with its methods, and apply the implements keyword along with the interface names on objects that implement the interface methods.
This allows for writing code that reduces the dependency on implementation details, makes it easier to reuse code, and supports a polymorphing way of calling object methods, which again can be used for substituting business logic. The upcoming Dynamics 365 Business Central 2020 Wave 1 release (version 16) introduces the concept of Interfaces in AL.Īn interface is used when you want to decide which capabilities need to be available for an object, while allowing actual implementations to differ, as long as they comply with the defined interface.
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