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Should methods in a Java interface be declared with or without the public access modifier?

Technically it doesn't matter, of course. A class method that implements an interface is always public. But what is a better convention?

Java itself is not consistent in this. See for instance Collection vs. Comparable, or Future vs. ScriptEngine.

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Try JLS, it will clear your doubts

It is permitted, but discouraged as a matter of style, to redundantly specify the public and/or abstract modifier for a method declared in an interface.