Remove explicit type parameters which can be inferred

Change-Id: I62cd4df252bab6208e1b1cd37f8f8757b0cfc17e
diff --git a/core/api/src/main/java/org/onosproject/net/PortNumber.java b/core/api/src/main/java/org/onosproject/net/PortNumber.java
index df45c54..dd77d0c 100644
--- a/core/api/src/main/java/org/onosproject/net/PortNumber.java
+++ b/core/api/src/main/java/org/onosproject/net/PortNumber.java
@@ -95,7 +95,7 @@
 
     // lazily populated Logical port number to PortNumber
     static final Supplier<Map<Long, Logical>> LOGICAL = Suppliers.memoize(() -> {
-            Builder<Long, Logical> builder = ImmutableMap.<Long, Logical>builder();
+            Builder<Long, Logical> builder = ImmutableMap.builder();
             for (Logical lp : Logical.values()) {
                 builder.put(lp.number(), lp);
             }
diff --git a/core/api/src/main/java/org/onosproject/net/host/DefaultHostDescription.java b/core/api/src/main/java/org/onosproject/net/host/DefaultHostDescription.java
index 915892b..3503eca 100644
--- a/core/api/src/main/java/org/onosproject/net/host/DefaultHostDescription.java
+++ b/core/api/src/main/java/org/onosproject/net/host/DefaultHostDescription.java
@@ -52,7 +52,7 @@
     public DefaultHostDescription(MacAddress mac, VlanId vlan,
                                   HostLocation location,
                                   SparseAnnotations... annotations) {
-        this(mac, vlan, location, Collections.<IpAddress>emptySet(),
+        this(mac, vlan, location, Collections.emptySet(),
              annotations);
     }
 
diff --git a/core/api/src/test/java/org/onosproject/store/service/VersionedTest.java b/core/api/src/test/java/org/onosproject/store/service/VersionedTest.java
index 86c497c..2533abe 100644
--- a/core/api/src/test/java/org/onosproject/store/service/VersionedTest.java
+++ b/core/api/src/test/java/org/onosproject/store/service/VersionedTest.java
@@ -54,7 +54,7 @@
      */
     @Test
     public void testMap() {
-        Versioned<String> tempObj = stats1.<String>map(VersionedTest::transform);
+        Versioned<String> tempObj = stats1.map(VersionedTest::transform);
         assertThat(tempObj.value(), is("1"));
     }