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WS architecture - implementing interface

 
Greenhorn
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Hi guys,

what I want to ask is why the following practice is a good one whenever you have to create a WS architecture (but maybe this could not be the only case but a generic good practice):





Why we should expose an interface marked as our API (Api interface) instead of expose the class that implement that interface (Controller class)? Do we follow some specific practice or principles doing this?

Thanks.
 
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