Groups > comp.lang.java.programmer > #20882

Re: Why is that in JDK8: value used in lambda expression shuld be effectively final?

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!news2.arglkargh.de!news.swapon.de!eternal-september.org!feeder.eternal-september.org!mx04.eternal-september.org!.POSTED!not-for-mail
From	Steven Simpson <ss@domain.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Why is that in JDK8: value used in lambda expression shuld be effectively final?
Date	Wed, 02 Jan 2013 21:46:00 +0000
Organization	A noiseless patient Spider
Lines	14
Message-ID	<odmer9-onl.ln1@s.simpson148.btinternet.com> (permalink)
References	<c885bedb-977c-49b4-a10a-b9cdd3df1dd9@googlegroups.com> <m0sdr9-0tg.ln1@s.simpson148.btinternet.com> <9f030e71-96ab-4ead-9690-4369f4a19aa9@googlegroups.com> <pk7er9-i4j.ln1@s.simpson148.btinternet.com> <d6fdb884-3181-4b37-a011-6da19e649758@googlegroups.com>
Mime-Version	1.0
Content-Type	text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding	7bit
Injection-Info	mx04.eternal-september.org; posting-host="0d771e3708e29ef01409ed69429633ae"; logging-data="22601"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18VUDyL+LVIbxsOBdVcE/okdiUfHGTMtpI="
User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0
In-Reply-To	<d6fdb884-3181-4b37-a011-6da19e649758@googlegroups.com>
Cancel-Lock	sha1:W1L6PuVBaag+pVQDWsaOSAGx6aY=
Xref	csiph.com comp.lang.java.programmer:20882

Show key headers only | View raw

On 02/01/13 19:31, Saxo wrote:
>> int sum = ints.reduce(0, (x, y) -> x + y);
> Nice, but it does not compile with me. I use IDEA 12 and the lambda-8-b69-windows-i586-17_dec_2012 JDK. Seems like reduce does not exist in Iterator or Collection!?

I figured, if forEach is on Collection, reduce likely would be too. I 
did try to have a look for it in source, but wasn't sure if I had the 
right branch.  I also didn't find the javadoc on-line.  Based on the 
source, try:

   ints.stream().reduce(0, (x, y) -> x + y)

-- 
ss at comp dot lancs dot ac dot uk

Thread

Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? jeti789@web.de - 2013-01-02 07:08 -0800
  Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? jeti789@web.de - 2013-01-02 07:52 -0800
  Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-02 17:33 +0000
    Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-02 11:31 -0800
      Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 12:52 -0800
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-01-02 20:58 -0400
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 17:40 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-01-03 20:43 -0400
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-02 23:44 -0800
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Patricia Shanahan <pats@acm.org> - 2013-01-03 07:57 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-03 13:22 -0800
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Patricia Shanahan <pats@acm.org> - 2013-01-03 16:14 -0800
      Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-02 21:46 +0000
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Lew <lewbloch@gmail.com> - 2013-01-02 17:35 -0800
        Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-03 02:13 -0800
          Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-03 06:45 -0800
            Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-04 21:32 +0000
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2013-01-04 14:38 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-04 23:45 +0000
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2013-01-04 17:24 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 13:20 +0000
              Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-05 01:50 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 11:21 +0000
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Saxo <jeti789@web.de> - 2013-01-05 04:27 -0800
                Re: Why is that in JDK8: value used in lambda expression shuld be effectively final? Steven Simpson <ss@domain.invalid> - 2013-01-05 12:58 +0000

csiph-web