Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail
From: Knute Johnson <nospam@knutejohnson.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: for :each style question
Date: Wed, 30 Nov 2011 16:49:44 -0800
Organization: A noiseless patient Spider
Lines: 39
Message-ID: <jb6iv8$8j1$1@dont-email.me>
References: <30fdd7tlkkejm29ufduhc9nnfk7uu3c6h0@4ax.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Thu, 1 Dec 2011 00:49:44 +0000 (UTC)
Injection-Info: mx04.eternal-september.org; posting-host="mz/LDSJwiWnk3Jnnqg7x+Q"; logging-data="8801"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18ZX632TcNSnkGeSpPtFUTJ"
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0
In-Reply-To: <30fdd7tlkkejm29ufduhc9nnfk7uu3c6h0@4ax.com>
Cancel-Lock: sha1:BtNUQXPt9TM80IPT1+Sd7MzLL5I=
Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:10389

On 11/30/2011 3:32 PM, Roedy Green wrote:
> In a for:each loop, sometimes you want to treat the first and or last
> element specially.
>
> The obvious way to handle is to revert to a for int i= loop and check
> for special values of i.
>
> You can keep the for:each style if you have a boolean first= true that
> you set false to detect the first.
>
> I don't know of an equivalent way to detect the last.
>
> In the olden days I would have handled the first and last cases
> outside the loop, with the loop running over the middle elements. You
> can't do that with for:each.
>
> What do you consider the best style to deal with this?

public class test {
     public static void main(String[] args) {
         int ns[] = new int[23];
         int last = 0;

         for (int i=0; i<ns.length; i++)
             ns[i] = i;

         for (int n : ns) {
             last = n;
         }

         System.out.println(last);
     }
}

It's not elegant but it works.

-- 

Knute Johnson