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  1. Rules Repository
  2. RSPEC-2293

The diamond operator ("<>") should be used

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    Details

    • Type: Code Smell Detection
    • Status: Active
    • Resolution: Unresolved
    • Labels:
    • Message:
      Replace the type specification in this constructor call with the diamond operator ("<>"). [(sonar.java.source not set. Assuming 7 or greater.)]
    • Default Severity:
      Minor
    • Impact:
      Low
    • Likelihood:
      Low
    • Default Quality Profiles:
      Sonar way
    • Covered Languages:
      Java
    • Remediation Function:
      Constant/Issue
    • Constant Cost:
      1min
    • Analysis Scope:
      Main Sources, Test Sources
    • Implementation details:

      Description

      Java 7 introduced the diamond operator (<>) to reduce the verbosity of generics code. For instance, instead of having to declare a List's type in both its declaration and its constructor, you can now simplify the constructor declaration with <>, and the compiler will infer the type.

      Note that this rule is automatically disabled when the project's sonar.java.source is lower than 7.

      Noncompliant Code Example

      List<String> strings = new ArrayList<String>();  // Noncompliant
Map<String,List<Integer>> map = new HashMap<String,List<Integer>>();  // Noncompliant

      Compliant Solution

      List<String> strings = new ArrayList<>();
Map<String,List<Integer>> map = new HashMap<>();

        Attachments

          Issue Links

          is implemented by

          New Feature - A new feature of the product, which has yet to be developed. SONARJAVA-1276 Rule : S2293 The diamond operator ("<>") should be used

          • Major - Major loss of function.
          • Closed
          is related to

          Sub-task - The sub-task of the issue SONARJAVA-3910 Add quick fixes for S2293 (DiamondOperatorCheck)

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. SONARJAVA-1607 NPE on S2293 when using parametrized types in lambda

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. SONARJAVA-3185 S2293 fails analysis with IllegalStateException

          • Major - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SONARJAVA-2549 FN on S2293 on method invocation

          • Major - Major loss of function.
          • Closed

            Activity

              People

              Assignee:
              Unassigned Unassigned
              Reporter:
              ann.campbell.2 Ann Campbell
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                Dates

                Created:
                Updated: