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  1. JDK
  2. JDK-8247237

change compiler error: local classes must not extend sealed classes, if class is anonymous

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Won't Fix
    • Affects Version/s: 15
    • Fix Version/s: 15
    • Component/s: tools
    • Labels:

      Description

      Compiling this program

      public class Main {
          public static void main(String[] args) {
              Shape shape = new Shape() {};
          }
      }

      sealed interface Shape {
      }

      leads to an error:

      error: local classes must not extend sealed classes
              Shape shape = new Shape() {};
                                        ^

      But the class of `shape` is an anonymous class rather than a local class.
      By definition, a local class must have a name (JLS 14.3). I think the error
      message should say " anonymous classes must not extend sealed classes".

      reported at amber-dev: https://mail.openjdk.java.net/pipermail/amber-dev/2020-June/006186.html

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            • Assignee:
              vromero Vicente Arturo Romero Zaldivar
              Reporter:
              vromero Vicente Arturo Romero Zaldivar
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              Dates

              • Created:
                Updated:
                Resolved: