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Groups > comp.lang.java.programmer > #9695

Re: constructing a constant HashMap

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On 11/6/2011 5:37 PM, Lew wrote:
> Arne Vajhøj wrote:
>> B1ll Gat3s wrote:
>>> Arne Vajhøj wrote:
>>>> B1ll Gat3s wrote:
>>>>> This works in ANY setting where an expression of type Map<String,String>
>>>>> is appropriate:
>>>>>
>>>>> new HashMap<String,String>  () {
>>>>> {
>>>>> put("aaa", "bbb");
>>>>> ...
>>>>> }}
>>>>
>>>> But it is way more difficult to read
>>>
>>> No it isn't.
>>
>> Yes - it is.
>>
>> Read what Tom wrote:
>>
>> #and it is a very useful but also highly surprising construct (i love
>> #dropping one in front of my pair when pair programming, and watching
>> #their brains trying to work out what's going on - it takes a while to
>> #realise it's not a special syntax, just a combination of two other
>> #bits of syntax).
>
> Yeah, but once you're used to it it's quite readable.  So you're both right.
>
> The question of "readability" shouldn't be treated like an absolute - it is or it ain't.  Readability is relative to experience and cognitive style.  To someone not trained in computer programmers, none of it is readable.  To a junior programmer, anonymous classes are rather "unreadable".  Should you eschew them for that reason?  To a slightly less junior programmer the anonymous-class/initializer combination cited here is strange, but should you really code to his level?  Or maybe should that programmer up their skill a little and stop being so namby-pamby about legitimate, useful syntax?
>
> There's also a relative readability between that idiom and alternatives to load a Map.  There's gotta be an initializer somewhere, folks!
>
> Personally, I don't like the overly-clever anonymous/initializer idiom.  I prefer a stodgy old separate initializer block and a non-subclasses HashMap.  I think it's more readable that way than the tricky subclass way presented here.

Readability is relative to the reader.

But let me rephrase to: this construct will puzzle significant
more developers than the other solutions suggested.

Arne

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Thread

constructing a constant HashMap Roedy Green <see_website@mindprod.com.invalid> - 2011-10-15 18:14 -0700
  Re: constructing a constant HashMap Arne Vajhøj <arne@vajhoej.dk> - 2011-10-15 21:36 -0400
    Re: constructing a constant HashMap Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-10-16 16:51 +0200
  Re: constructing a constant HashMap markspace <-@.> - 2011-10-15 18:59 -0700
    Re: constructing a constant HashMap Roedy Green <see_website@mindprod.com.invalid> - 2011-10-15 19:25 -0700
  Re: constructing a constant HashMap Roedy Green <see_website@mindprod.com.invalid> - 2011-10-15 19:19 -0700
  Re: constructing a constant HashMap Patricia Shanahan <pats@acm.org> - 2011-10-16 06:07 +0100
    Re: constructing a constant HashMap B1ll Gat3s <wm.g4t3s@m1cr0s0f7.c0m> - 2011-10-16 01:29 -0400
      Re: constructing a constant HashMap Tom Anderson <twic@urchin.earth.li> - 2011-10-17 00:57 +0100
        Re: constructing a constant HashMap Patricia Shanahan <pats@acm.org> - 2011-10-17 01:02 +0100
      Re: constructing a constant HashMap Arne Vajhøj <arne@vajhoej.dk> - 2011-10-16 22:20 -0400
        Re: constructing a constant HashMap B1ll Gat3s <wm.g4t3s@m1cr0s0f7.c0m> - 2011-10-17 21:35 -0400
          Re: constructing a constant HashMap Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-10-18 09:28 -0700
            Re: constructing a constant HashMap David Lamb <dalamb@cs.queensu.ca> - 2011-10-20 12:55 -0400
          Re: constructing a constant HashMap Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 16:16 -0500
            Re: constructing a constant HashMap Lew <lewbloch@gmail.com> - 2011-11-06 14:37 -0800
              Re: constructing a constant HashMap Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 18:00 -0500
                Re: constructing a constant HashMap Ian Pilcher <arequipeno@gmail.com> - 2011-11-06 18:34 -0600
                Re: constructing a constant HashMap Arne Vajhøj <arne@vajhoej.dk> - 2011-11-06 19:47 -0500
            Re: constructing a constant HashMap B1ll Gat3s <wm.g4t3s@m1cr0s0f7.c0m> - 2011-11-07 12:23 -0500
    Re: constructing a constant HashMap Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-10-16 11:11 -0300
  Re: constructing a constant HashMap Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-10-16 10:39 -0700

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