Re: "final" in "for"

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 15 Dec 2009 02:00:05 -0500

Message-ID:

<hg7c5n$o0d$1@news.albasani.net>

Daniel Pitts wrote:

Roedy Green wrote:

On Mon, 14 Dec 2009 17:58:30 -0800, Daniel Pitts
<newsgroup.spamfilter@virtualinfinity.net> wrote, quoted or indirectly
quoted someone who said :

for (String s: someSet) {
s = "nope";
}

compiles and runs.

Arrgh. I guess then you could extend java with

for ( final String s : someSet )

I sure hope lints complain at s="nope";

That is an existing construct, which does what you expect :-) No need to
extend.

SSCCE (JDK 1.6.0_17):

package testit;
public class Freach
{
   public static void main( String [] args )
   {
     Set <String> strangs = new HashSet <String> ();
     Set <Integer> ants = new HashSet <Integer> ();

     for ( String strang : strangs )
     {
       System.out.println( "strang = \""+ strang +"\"" );
       strang = "else";
     }
     for ( final String strang : strangs )
     {
       System.out.println( "strang = \""+ strang +"\"" );
       // strang = "else"; // compiler error
     }

     for ( int ant : ants )
     {
       System.out.println( "ant = \""+ ant +"\"" );
       ant = 17;
     }
     for ( final int ant : ants )
     {
       System.out.println( "ant = \""+ ant +"\"" );
       // ant = 17; // compiler error
     }
   }
}

--
Lew