Use dianmond operator

Change-Id: I551dd9443b10ef17832f74a554486b7605e9866a
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
index 59fc4ca..d802be9 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
@@ -221,7 +221,7 @@
                                     Set<DeviceId> nextHops) {
 
         TrafficSelector.Builder sbuilder = DefaultTrafficSelector.builder();
-        List<ForwardingObjective.Builder> fwdObjBuilders = new ArrayList<ForwardingObjective.Builder>();
+        List<ForwardingObjective.Builder> fwdObjBuilders = new ArrayList<>();
 
         // TODO Handle the case of Bos == false
         sbuilder.matchMplsLabel(MplsLabel.mplsLabel(config.getSegmentId(destSwId)));