Use diamond operator

Change-Id: I966c7033fc97259b3c3727a07d552c675a9446a4
diff --git a/core/net/src/test/java/org/onosproject/net/proxyarp/impl/ProxyArpManagerTest.java b/core/net/src/test/java/org/onosproject/net/proxyarp/impl/ProxyArpManagerTest.java
index 3978c48..1a160d9 100644
--- a/core/net/src/test/java/org/onosproject/net/proxyarp/impl/ProxyArpManagerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/proxyarp/impl/ProxyArpManagerTest.java
@@ -195,7 +195,7 @@
      * need is to occupy the ports with some link.
      */
     private void createLinks(int numDevices) {
-        List<Link> links = new ArrayList<Link>();
+        List<Link> links = new ArrayList<>();
 
         for (int i = 1; i <= numDevices; i++) {
             ConnectPoint src = new ConnectPoint(