Should every Java domain class implement an interface? -


i've been looking on java project done @ company , in project developers created interface pretty ever domain entity (there hundreds). in cases, think abstraction works, in other cases doesn't seem need @ time.

whenever instances passed around referred , access via interface.

is bloat future proofing? or sound engineering practice?

interfaces specify required behavior without implementation. allow swap implementations without affecting clients. can useful techniques aspect-oriented programming or proxy generation.

but if implementation doesn't change, see no justification interface.

most model objects fall category. if there's no implementation differences, don't use interface.

interfaces terrific services , persistence classes, have never seen them used abstract model objects.


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