Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #13409

Re: diamond operator

Show all headers | View raw

W dniu 2012-04-04 03:54, Roedy Green pisze:
> I was looking over the table of contents of a book about new features
> in Java 7 and came across a reference to the "diamond operator".
>
> It turns out to be simple, but one of the precious bits of Java
> syntactic sugar to make it terser.
>
> http://fahdshariff.blogspot.ca/2011/07/java-7-diamond-operator.html
>
> http://mindprod.com/book/9781849685627.html

It will be better to provide "auto" type detector, like in C++.
For example, instead of:
   Map<Integer, List<String>> map = new HashMap<Integer, List<String>>();
use:
   auto map = new HashMap<Integer, List<String>>();

...and "map" variable will be resolved at compile time to 
HashMap<Integer, List<String>>.

This allow very handy construct, like:

   auto data = SomeService.getProviders();

In this case type of "data" will be deducted from return type of 
SomeService.getProviders().

This will save lot of typing. And save refactoring time in case if 
getProviders return type changes. And will auto-adapt to changes in 
libraries.

-- 
Arivald

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

diamond operator Roedy Green <see_website@mindprod.com.invalid> - 2012-04-03 18:54 -0700
  Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-03 22:06 -0400
  Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-04 13:12 +0200
    Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-04 08:23 -0400
      Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-04 15:40 +0200
      Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-04 19:41 -0400
        Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-05 08:03 -0400
  Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-04 10:23 -0600
    Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-04 18:15 -0700
      Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-05 15:44 -0400
        Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-05 14:54 -0600
    Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-06 12:06 +0200
      Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-06 10:53 -0700
        Re: diamond operator Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-04-06 21:35 -0500
          Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-05-05 20:07 -0400
      Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-06 19:56 -0600
        Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-06 20:02 -0600
  Re: diamond operator Arivald <NOSPAMarivald@interia.pl> - 2012-04-05 10:11 +0200
    Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-05 11:34 -0700
      Re: diamond operator Arivald <NOSPAMarivald@interia.pl> - 2012-04-05 22:02 +0200
        Re: diamond operator ObeseeExpen <ObeseeExpen.5ibto0@no-mx.forums.yourdomain.com.au> - 2012-09-03 12:39 -0400
      Re: diamond operator Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-04-05 18:18 -0500
      Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-05 19:38 -0400
      Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-06 17:07 +0200
        Re: diamond operator Thufir <hawat.thufir@gmail.com> - 2012-04-06 08:51 -0700
          Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-08 15:12 +0200
    Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-05 19:41 -0400

csiph-web