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From Henri Yandell <bay...@generationjava.com>
Subject RE: DBCP/LANG
Date Sun, 11 Aug 2002 22:15:43 GMT

If you look in jakarta-commons-sandbox/lang, there is an Enum
implementation in there.

On Sun, 11 Aug 2002, Martin Cooper wrote:

>
>
> > -----Original Message-----
> > From: Juozas Baliuka [mailto:baliuka@centras.lt]
> > Sent: Sunday, August 11, 2002 2:57 PM
> > To: Jakarta Commons Developers List
> > Subject: Re: DBCP/LANG
> >
> >
> > <snip>
> > > > Sorry, my misunderstanding. As Ola pointed out [rather
> > > > cryptically] the
> > > > Enum is from the C meaning and not the Enumeration Java
> > meaning. An
> > > > ordered set of constant values.
> > >
> > > Not necessarily ordered. An Enum of colours, for example,
> > in most cases
> > > would not have a defined ordering.
> > >
> > > > They seem to be a feature often grumbled about not being in
> > > > Java and often
> > > > recreated by coders in Java, so a useful Commons feature.
> > >
> > > Definitely. The key reason that people create these, I
> > believe, is type
> > > safety (which is not one of the features of C enums).
> >
> > Is it some way to implement C style or  type safe C ++ and
> > PASCAL style
> > enums
> > in JAVA ? JAVA developers use "final int RED=0x000000FF" and
> > I do not see
> > any ways to implement something like this :
> >
> >  enum Color
> >         {
> >                      black,
> >                       red    = 0x000000FF,
> >                       green = 0x0000FF00,
> >                       blue   = 0x00FF0000,
> >                       white = red | green | blue
> >        };
>
> Sure. Something like this:
>
> public class Color {
>     protected int color;
>     protected Color(int color) {
>         this.color = color;
>     }
>     public final static Color BLACK = new Color(0);
>     public final static Color RED = new Color(0x000000FF);
>     ...
> }
>
> Also, Dmitri Plotnikov posted a link here to his implementation last month:
>
> http://marc.theaimsgroup.com/?l=jakarta-commons-dev&m=102633830506924&w=2
>
> --
> Martin Cooper
>
>
> >
> > Is it some "wrappers" ?
> >
> >
> >
> > > --
> > > Martin Cooper
> > >
> > >
> > > >
> > > > Hen
> > > >
> > > >
> > > > --
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> > >
> > >
> > >
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> > >
> >
> >
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>
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