Java records used in enums

[Alberto Otero Rodríguez]

It seems a non-existent problem until you face it, which is what happened me today.

I think at least (supposing enums can't be records) all the fields in enums should be made final by default.

Regards,

Alberto.
________________________________
De: Kasper Nielsen <kasperni at gmail.com>
Enviado: viernes, 21 de mayo de 2021 16:28
Para: Alberto Otero Rodríguez <albest512 at hotmail.com>
Cc: core-libs-dev at openjdk.java.net <core-libs-dev at openjdk.java.net>
Asunto: Re: Java records used in enums

On Fri, 21 May 2021 at 14:51, Alberto Otero Rodríguez <albest512 at hotmail.com<mailto:albest512 at hotmail.com>> wrote:
Hi,

I think enums in Java should be immutable. When you let the programmer change values in an enum instance, an unexpected behaviour can happen when using multiple threads as enum instances are static (singleton).

So, I was wondering why not make enums instances be defined as records instead of normal classes.

Lots of reasons, for example:
* It would be a breaking change for an almost non-existent problem.
* All internal state of enums would now be public.
* Enum's extend java.lang.Enum, records extend java.lang.Record.
  java.lang.Enum cannot extend java.lang.Record because it has instance fields.

/Kasper