[jira] [Created] (SPARK-13702) Use diamond operator for generic instance creation in Java code

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

Dongjoon Hyun created SPARK-13702:
-------------------------------------

             Summary: Use diamond operator for generic instance creation in Java code
                 Key: SPARK-13702
                 URL: https://issues.apache.org/jira/browse/SPARK-13702
             Project: Spark
          Issue Type: Improvement
            Reporter: Dongjoon Hyun
            Priority: Trivial


Java 7 or higher supports `diamond` operator which replaces the type arguments required to invoke the constructor of a generic class with an empty set of type parameters (<>). Currently, Spark Java code use mixed usage of this. This issue replaces existing codes to use `diamond` operator and add Checkstyle rule.

{code}
-List<JavaPairDStream<String, String>> kafkaStreams = new ArrayList<JavaPairDStream<String, String>>(numStreams);
+List<JavaPairDStream<String, String>> kafkaStreams = new ArrayList<>(numStreams);
{code}

{code}
-    Set<Tuple2<Integer, Integer>> edges = new HashSet<Tuple2<Integer, Integer>>(numEdges);
+    Set<Tuple2<Integer, Integer>> edges = new HashSet<>(numEdges);
{code}

*Reference*
https://docs.oracle.com/javase/8/docs/technotes/guides/language/type-inference-generic-instance-creation.html



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