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Groups > comp.lang.java.programmer > #34602

Re: array of HashSet<>

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On 6/10/16 12:25 PM, Lew wrote:
> Roedy Green wrote:
>> Daniel Pitts wrote:
>>> Simplest work-around:  Use a List<Set<>> instead.
>>
>> Is what you are doing there just buryng the dirty work under the
>> covers? inside ArrayList?
>
> What do you mean by "just burying"? Is there something wrong with simplifying "dirty work"?
>
> And teasing out the objective part of your question from the purple prose, no, it isn't. Arrays in Java are not generic, and there is an explicit prohibition of making arrays out of non-reifiable types. These restrictions do not apply to generic collections, obviously. So no, it isn't "just" anything, let alone "burying" some sort of "dirty" work. It's allowing the compiler to check your type assertions at compile time.
>
To be fair, ArrayList<T> is implemented with a lot of "unsafe" type 
casting.  The difference is that the ArrayList implementation is 
guaranteed to be type-safe if generics are used.

So in a way it does the dirty work for you, but that isn't the same as 
burying it.  Since someone else has done the dirty work, why not take 
advantage of that, and use the proven type-safe interface.

Not to mention, it is often preferable to use less-primitive types that 
describe the entity you need.  Arrays are more primitive than Collection 
implementations.

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Thread

array of HashSet<> Roedy Green <see_website@mindprod.com.invalid> - 2016-02-26 16:12 -0800
  Re: array of HashSet<> Arne Vajhøj <arne@vajhoej.dk> - 2016-02-26 20:01 -0500
    Re: array of HashSet<> Arne Vajhøj <arne@vajhoej.dk> - 2016-02-27 10:05 -0500
  Re: array of HashSet<> Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2016-02-26 21:13 -0800
  Re: array of HashSet<> Robert Klemme <shortcutter@googlemail.com> - 2016-02-27 11:41 +0100
  Re: array of HashSet<> Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2016-02-27 11:54 -0800
    Re: array of HashSet<> Lew <lewbloch@gmail.com> - 2016-02-27 15:16 -0800
      Re: array of HashSet<> Lew <lewbloch@gmail.com> - 2016-02-27 15:18 -0800
  Re: array of HashSet<> Roedy Green <see_website@mindprod.com.invalid> - 2016-02-27 23:44 -0800
    Re: array of HashSet<> Lew <lewbloch@gmail.com> - 2016-02-28 01:52 -0800
    Re: array of HashSet<> Arne Vajhøj <arne@vajhoej.dk> - 2016-02-28 08:38 -0500
      Re: array of HashSet<> Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-02-28 08:56 -0500
        Re: array of HashSet<> Arne Vajhøj <arne@vajhoej.dk> - 2016-02-28 12:47 -0500
          Re: array of HashSet<> Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-02-28 13:27 -0500
            Re: array of HashSet<> Sebastian <news@seyweiler.dyndns.org> - 2016-02-28 23:53 +0100
              Re: array of HashSet<> Arne Vajhøj <arne@vajhoej.dk> - 2016-02-28 21:16 -0500
                Re: array of HashSet<> Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2016-02-28 23:36 -0800
                Re: array of HashSet<> Roedy Green <inquiry@mindprod.com> - 2016-06-08 20:08 -0700
              Re: array of HashSet<> Andreas Leitgeb <avl@logic.at> - 2016-02-29 13:19 +0000
                Re: array of HashSet<> Andreas Leitgeb <avl@logic.at> - 2016-02-29 13:27 +0000
  Re: array of HashSet<> Daniel Pitts <usenet@coloraura.com> - 2016-03-06 13:59 -0800
    Re: array of HashSet<> Roedy Green <inquiry@mindprod.com> - 2016-06-08 20:10 -0700
      Re: array of HashSet<> Lew <lewbloch@gmail.com> - 2016-06-10 12:25 -0700
        Re: array of HashSet<> Daniel Pitts <usenet@coloraura.com> - 2016-06-11 12:30 -0700
        Re: array of HashSet<> Roedy Green <inquiry@mindprod.com> - 2016-06-12 02:31 -0700

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