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Re: Enums: Properties vs. Methods

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markspace wrote:
> Robert Klemme wrote:
>> /** We use custom methods. */
>> public enum Meth {
>
>
> I agree with Lew that this second example was pretty confusing and hard to
> follow. I also think that it's difficult to predict memory usage without
> careful analysis.

In the approach with final variables, they will be as constants to the 
algorithm so there's really likely to be no memory waste there.  'return 
false;' requires 'false' to live somewhere, be it in the 'return' statement 
directly or optimized in as a constant from the 'final' variable.

> I'd like to see a "motivating" example. What do you actually intend to use
> this for? I can't see that a general case is too interesting, except to
> disqualify the method pattern.

Maybe overridable methods in enums are suitable only for behaviors, not 
attributes.

>> Then different
>> enums can have differing implementations of the method and we have an
>> instance of Strategy / State pattern.

> I don't think State works this way. Strategy ... maybe, but the use of enums
> for Strategy seems confining. I'd just use regular inheritance and classes.
> The "method pattern" for Strategy would be fine I think if it weren't
> shoe-horned into an enum.

Don't get him wrong - there are plenty of use cases for overridable methods 
that are ('final'ly) implemented in each enum instance.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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Re: Enums: Properties vs. Methods Lew <noone@lewscanon.com> - 2011-03-29 14:12 -0400

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