Groups > comp.lang.java.programmer > #2771

Re: java.lang vs java.util

From	Joshua Cranmer <Pidgeot18@verizon.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: java.lang vs java.util
Date	2011-04-02 16:22 -0400
Organization	A noiseless patient Spider
Message-ID	<in80ht$dbh$1@dont-email.me> (permalink)
References	<in67lq$rgo$1@lust.ihug.co.nz>

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On 04/02/2011 12:11 AM, Lawrence D'Oliveiro wrote:
> Surprising to see something defined in java.lang
> <http://developer.android.com/reference/java/lang/Iterable.html>  depend on
> something defined in java.util
> <http://developer.android.com/reference/java/util/Iterator.html>.
>
> Surely the hierarchy should go the other way?

Iterator is needed for for-each loops, which were added several versions 
after java.util.Iterator was introduced. Iterablity, being a "language 
feature" was put in java.lang, but to be backwards-compatible with those 
who already implemented java.util.Iterator, they used that class. There 
actually is a note somewhere saying that the developers would prefer to 
not have to do this, but decided that backwards compatibility was more 
important than modularity aesthetics.

-- 
Beware of bugs in the above code; I have only proved it correct, not 
tried it. -- Donald E. Knuth

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java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-02 17:11 +1300
  Re: java.lang vs java.util Patricia Shanahan <pats@acm.org> - 2011-04-01 21:23 -0700
    Re: java.lang vs java.util Lew <noone@lewscanon.com> - 2011-04-02 01:52 -0400
      Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-02 09:50 -0300
        Re: java.lang vs java.util David Lamb <dalamb@cs.queensu.ca> - 2011-04-02 09:12 -0400
          Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-03 12:37 +1200
            Re: java.lang vs java.util David Lamb <dalamb@cs.queensu.ca> - 2011-04-03 08:05 -0400
          Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-03 09:33 -0300
        Re: java.lang vs java.util "Mike Schilling" <mscottschilling@hotmail.com> - 2011-04-02 07:57 -0700
          Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-03 12:38 +1200
  Re: java.lang vs java.util Roedy Green <see_website@mindprod.com.invalid> - 2011-04-01 23:43 -0700
    Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-02 19:52 +1300
      Re: java.lang vs java.util David Lamb <dalamb@cs.queensu.ca> - 2011-04-03 08:05 -0400
        Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-04 10:11 +1200
          Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-03 19:25 -0300
            Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-04 12:49 +1200
              Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-03 22:50 -0300
                Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-04 16:05 +1200
                Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-04 07:06 -0300
                Re: java.lang vs java.util Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-04-04 23:10 +1200
                Re: java.lang vs java.util Leif Roar Moldskred <leifm@dimnakorr.com> - 2011-04-04 06:20 -0500
                Re: java.lang vs java.util rossum <rossum48@coldmail.com> - 2011-04-04 15:22 +0100
                Re: java.lang vs java.util Patricia Shanahan <pats@acm.org> - 2011-04-04 05:58 -0700
                Re: java.lang vs java.util Lew <noone@lewscanon.com> - 2011-04-06 15:34 -0400
                Re: java.lang vs java.util rossum <rossum48@coldmail.com> - 2011-04-07 10:22 +0100
                Re: java.lang vs java.util David Lamb <dalamb@cs.queensu.ca> - 2011-04-04 18:41 -0400
                Re: java.lang vs java.util Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-04 07:04 -0300
                Re: java.lang vs java.util Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-04 07:58 -0400
                Re: java.lang vs java.util David Lamb <dalamb@cs.queensu.ca> - 2011-04-04 18:46 -0400
  Re: java.lang vs java.util Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-02 16:22 -0400

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