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"Overriden methods" rule ignores implementations of interface methods during the search and so it doesn't add @Override annotation to these methods. On the other hand, when editing class implementing an interface, editor suggests to add @Override annotation to methods implementing methods from interface so I suppose the "Overriden methods" rule should add @Override annotation also to these methods implementing methods from interfaces.
The Java 6 spec was updated to state that the Override annotation applies to supertypes rather than just superclasses. Thanks for catching this.