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Groups > comp.lang.java.programmer > #13445

Re: diamond operator

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Silvio Bierman <silvio@moc.com> writes:

> On 04/04/2012 06:23 PM, Jim Janney wrote:
>> Roedy Green<see_website@mindprod.com.invalid>  writes:
>>
>>> 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
>>
>> This isn't wrong, but it fixes a problem I never knew I had.  Any
>> competent IDE will expand that for you anyway.
>>
>
> IDE support is irrelevant in this discussion. Language syntax is not
> about typing.
>
> Code needs to be read and reasoned about. The better the syntax, the
> less reading effort needed to be able to reason. Java's redundant
> syntax in this respect is inefficient and the diamond operator takes
> away part of that.

I agree on the importance of readability, but as far as I can tell the
diamond operator offers only a fairly minor improvement there: the 1.4
syntax is redundant, yes, but not error prone.  When looking at code
like

Map<String, List<Pair<Int, Double>>> m = new HashMap<String, List<Pair<Int, Double>>>();

I don't need to study the second list of types looking for subtle
mistakes: it's either correct or it won't compile.

-- 
Jim Janney

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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

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