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Re: Why only public methods on interfaces?

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Date	Thu, 07 Apr 2011 22:37:57 -0700
From	Patricia Shanahan <pats@acm.org>
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Subject	Re: Why only public methods on interfaces?
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On 4/7/2011 10:01 PM, Owen Jacobson wrote:
> On 2011-04-08 00:49:02 -0400, Patricia Shanahan said:
>
>> On 4/7/2011 5:09 PM, kramer31 wrote:
>>> Could someone please explain to me the rational behind only allowing
>>> public methods on interfaces? In my mind, protection and interfaces
>>> are two independent if perhaps somewhat related concepts.
>>
>> I think the original Java design underestimated the extreme usefulness
>> of Java interfaces. At the time one of their uses, representing the
>> public face of a package, was assumed to be the only possible use.
>>
>> I've wanted to use intra-package interfaces, containing only default
>> access methods. There is an unpleasant choice between making something
>> that should be an interface into an abstract class or having public
>> methods that are supposed to only be used within one package.
>
> As Stefan pointed out, interfaces themselves don't have to be public.
> This is legal:
>
> package com.example;
>
> interface SomeInternalAbstraction {
> public void flog(Horse horse);
> }
>
> -o
>

Yes, but then the implementing methods do have to be public, which is
undesirable if they should not be used outside the package.

Patricia

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Thread

Why only public methods on interfaces? kramer31 <kramer.newsreader@gmail.com> - 2011-04-07 17:09 -0700
  Re: Why only public methods on interfaces? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-07 21:48 -0300
  Re: Why only public methods on interfaces? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-07 21:01 -0400
    Re: Why only public methods on interfaces? v_borchert@despammed.com (Volker Borchert) - 2011-04-08 02:43 +0000
      Re: Why only public methods on interfaces? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-08 00:24 -0400
  Re: Why only public methods on interfaces? Patricia Shanahan <pats@acm.org> - 2011-04-07 21:49 -0700
    Re: Why only public methods on interfaces? Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-08 01:01 -0400
      Re: Why only public methods on interfaces? Patricia Shanahan <pats@acm.org> - 2011-04-07 22:37 -0700
        Re: Why only public methods on interfaces? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-04-08 00:14 -0700
          Re: Why only public methods on interfaces? Patricia Shanahan <pats@acm.org> - 2011-04-08 06:59 -0700
            Re: Why only public methods on interfaces? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-04-08 07:17 -0700
              Re: Why only public methods on interfaces? Patricia Shanahan <pats@acm.org> - 2011-04-08 08:59 -0700
                Re: Why only public methods on interfaces? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-04-08 17:27 -0700
                Re: Why only public methods on interfaces? "Mike Schilling" <mscottschilling@hotmail.com> - 2011-04-09 22:14 -0700
                Re: Why only public methods on interfaces? "Mike Schilling" <mscottschilling@hotmail.com> - 2011-04-09 22:28 -0700
                Re: Why only public methods on interfaces? Tom Anderson <twic@urchin.earth.li> - 2011-04-10 16:02 +0100
  Re: Why only public methods on interfaces? Roedy Green <see_website@mindprod.com.invalid> - 2011-04-08 03:18 -0700
    Re: Why only public methods on interfaces? Esmond Pitt <esmond.pitt@bigpond.com> - 2011-04-08 20:32 +1000
  Re: Why only public methods on interfaces? Tom Anderson <twic@urchin.earth.li> - 2011-04-08 20:34 +0100
  Re: Why only public methods on interfaces? Tom Anderson <twic@urchin.earth.li> - 2011-04-10 18:10 +0100

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