Groups > comp.lang.java.programmer > #2990

Re: Why only public methods on interfaces?

From	Roedy Green <see_website@mindprod.com.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Why only public methods on interfaces?
Date	2011-04-08 03:18 -0700
Organization	Canadian Mind Products
Message-ID	<u2otp6tfib1oap453ehfv36vca1tlpfmp5@4ax.com> (permalink)
References	<25875c94-9af2-4d28-976d-2050a738ae2e@n10g2000yqf.googlegroups.com>

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On Thu, 7 Apr 2011 17:09:51 -0700 (PDT), kramer31
<kramer.newsreader@gmail.com> wrote, quoted or indirectly quoted
someone who said :

>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.

Interfaces are for gluing things together that have different
ancestries.  If you could specify that at interface were package
scope, which you would limit all implementors to being in the
interface's package.  In that case, you might as well use an abstract
class.

I too have often wanted non-public methods in interfaces, but that is
a possible rationale why they are always public.
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
Doing what the user expects with respect to navigation is absurdly important for user satisfaction.
~ anonymous Google Android developer

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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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