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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