Sho SHIMIZU

Use concrete type instead of interface

Change-Id: Id36816eb7711305c01b47d73048cc6a3c868405f
......@@ -27,7 +27,7 @@ import java.util.Set;
* Represents an empty set of discrete resource.
*/
final class EmptyDiscreteResources implements DiscreteResources {
static final DiscreteResources INSTANCE = new EmptyDiscreteResources();
static final EmptyDiscreteResources INSTANCE = new EmptyDiscreteResources();
// for serializer
private EmptyDiscreteResources() {}
......