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  1. JDK
  2. JDK-8073381

need API to get enum's values without creating a new array

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Details

    • Enhancement
    • Resolution: Unresolved
    • P3
    • tbd
    • None
    • core-libs

    Description

      Every enum type provides a values() method that returns an array of the enum constants. Since arrays are mutable, the returned array must be a freshly created copy of the internal array.

      It would be nice to have an API that returned an object that represented the enum constants, but avoided having to make a copy of the array just for defensive purposes. For some enum type E this could be something like Stream<E> or perhaps List<E>, with the latter having properties of being random-access and immutable.

      Something to consider is having two "flavors" or this method, one on the enum type itself, and another on java.lang.Enum or java.lang.Class that would provide the values for an enum given its class. This is similar to the situation with values(), which occurs directly on the enum type, and which has an equivalent java.lang.Class.getEnumConstants().

      Attachments

        Issue Links

          duplicates

          Enhancement - null JDK-8174804 Add support for functional programming to enums.

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          relates to

          JEP - Java Enhancement Proposal JDK-8170351 JEP 301: Enhanced Enums

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-6234270 Class Enum needs a function like Enum<E> getEnumFor(int)

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Enhancement - null JDK-6548438 (enum) java.lang.Enum should have a values(Class<T>) method.

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Closed

          Enhancement - null JDK-5034509 (enum) Add a function to query if enum name is a valid enum constant name

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          JEP - Java Enhancement Proposal JDK-8261007 Frozen Arrays (Preview)

          • P3 - Major loss of function.
          • Draft

          Activity

            People

              psandoz Paul Sandoz
              smarks Stuart Marks
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              Dates

                Created:
                Updated: