Use dianmond operator

Change-Id: I551dd9443b10ef17832f74a554486b7605e9866a
diff --git a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
index c46af6e..044397e 100644
--- a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
+++ b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/SubnetWebResource.java
@@ -149,7 +149,7 @@
             throws IOException {

         try {

             SubnetId subId = SubnetId.subnetId(id);

-            Set<SubnetId> subIds = new HashSet<SubnetId>();

+            Set<SubnetId> subIds = new HashSet<>();

             subIds.add(subId);

             get(SubnetService.class).removeSubnets(subIds);

             return Response.status(201).entity("SUCCESS").build();

@@ -183,7 +183,7 @@
      */

     public Iterable<Subnet> changeJsonToSubs(JsonNode subnetNodes) {

         checkNotNull(subnetNodes, JSON_NOT_NULL);

-        Map<SubnetId, Subnet> subMap = new HashMap<SubnetId, Subnet>();

+        Map<SubnetId, Subnet> subMap = new HashMap<>();

         for (JsonNode subnetNode : subnetNodes) {

             if (!subnetNode.hasNonNull("id")) {

                 return null;

@@ -229,7 +229,7 @@
         checkNotNull(subnetNodes, JSON_NOT_NULL);

         checkArgument(subnetNodes.get("enable_dhcp").isBoolean(), "enable_dhcp should be boolean");

         checkArgument(subnetNodes.get("shared").isBoolean(), "shared should be boolean");

-        Map<SubnetId, Subnet> subMap = new HashMap<SubnetId, Subnet>();

+        Map<SubnetId, Subnet> subMap = new HashMap<>();

         if (!subnetNodes.hasNonNull("id")) {

             return null;

         }

diff --git a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
index 9fd75ab..cd2ac29 100644
--- a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
+++ b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/TenantNetworkWebResource.java
@@ -240,7 +240,7 @@
     @Path("{id}")

     public Response deleteNetworks(@PathParam("id") String id) {

         log.debug("Deletes network by identifier {}.", id);

-        Set<TenantNetworkId> networkSet = new HashSet<TenantNetworkId>();

+        Set<TenantNetworkId> networkSet = new HashSet<>();

         networkSet.add(TenantNetworkId.networkId(id));

         Boolean issuccess = nullIsNotFound(get(TenantNetworkService.class)

                 .removeNetworks(networkSet), NETWORK_NOT_FOUND);

diff --git a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
index 0a427bb..1cb1444 100644
--- a/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
+++ b/apps/vtnweb/src/main/java/org/onosproject/vtnweb/resources/VirtualPortWebResource.java
@@ -131,7 +131,7 @@
     @Path("{portUUID}")

     @DELETE

     public Response deletePorts(@PathParam("portUUID") String id) {

-        Set<VirtualPortId> vPortIds = new HashSet<VirtualPortId>();

+        Set<VirtualPortId> vPortIds = new HashSet<>();

         try {

             if (id != null) {

                 vPortIds.add(VirtualPortId.portId(id));

@@ -201,8 +201,8 @@
      */

     public Iterable<VirtualPort> changeJsonToPorts(JsonNode vPortNodes) {

         checkNotNull(vPortNodes, JSON_NOT_NULL);

-        Map<VirtualPortId, VirtualPort> portMap = new HashMap<VirtualPortId, VirtualPort>();

-        Map<String, String> strMap = new HashMap<String, String>();

+        Map<VirtualPortId, VirtualPort> portMap = new HashMap<>();

+        Map<String, String> strMap = new HashMap<>();

         for (JsonNode vPortnode : vPortNodes) {

             VirtualPortId id = VirtualPortId.portId(vPortnode.get("id")

                     .asText());

@@ -220,7 +220,7 @@
                     .asText());

             String deviceOwner = vPortnode.get("device_owner").asText();

             JsonNode fixedIpNodes = vPortNodes.get("fixed_ips");

-            Set<FixedIp> fixedIps = new HashSet<FixedIp>();

+            Set<FixedIp> fixedIps = new HashSet<>();

             for (JsonNode fixedIpNode : fixedIpNodes) {

                 FixedIp fixedIp = jsonNodeToFixedIps(fixedIpNode);

                 fixedIps.add(fixedIp);

@@ -265,8 +265,8 @@
      */

     public Iterable<VirtualPort> changeJsonToPort(JsonNode vPortNodes) {

         checkNotNull(vPortNodes, JSON_NOT_NULL);

-        Map<VirtualPortId, VirtualPort> vportMap = new HashMap<VirtualPortId, VirtualPort>();

-        Map<String, String> strMap = new HashMap<String, String>();

+        Map<VirtualPortId, VirtualPort> vportMap = new HashMap<>();

+        Map<String, String> strMap = new HashMap<>();

         VirtualPortId id = VirtualPortId.portId(vPortNodes.get("id").asText());

         String name = vPortNodes.get("name").asText();

         TenantId tenantId = TenantId.tenantId(vPortNodes.get("tenant_id")

@@ -281,7 +281,7 @@
                 .asText());

         String deviceOwner = vPortNodes.get("device_owner").asText();

         JsonNode fixedIpNodes = vPortNodes.get("fixed_ips");

-        Set<FixedIp> fixedIps = new HashSet<FixedIp>();

+        Set<FixedIp> fixedIps = new HashSet<>();

         for (JsonNode fixedIpNode : fixedIpNodes) {

             FixedIp fixedIp = jsonNodeToFixedIps(fixedIpNode);

             fixedIps.add(fixedIp);