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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: array of HashSet<>
Date: Sun, 28 Feb 2016 13:27:46 -0500
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On 2/28/2016 12:47 PM, Arne Vajhøj wrote:
> On 2/28/2016 8:56 AM, Eric Sosman wrote:
>> On 2/28/2016 8:38 AM, Arne Vajhøj wrote:
>>> On 2/28/2016 2:44 AM, Roedy Green wrote:
>>>> I am not trying to arrange the HashSet fields in order in an array. I
>>>> am just trying to do something like this:
>>>>
>>>>           private final HashSet<Long>[] hashSets;
>>>
>>>>          hashSets = new HashSet[ filesToProcess.length ];
>>>
>>>> I get this error message:
>>>>
>>>> Warning:(104, 20) java: unchecked conversion
>>>>    required: java.util.HashSet<java.lang.Long>[]
>>>>    found:    java.util.HashSet[]
>>>
>>> hashSets = new HashSet<Long>[ filesToProcess.length ]
>>>
>>> should fix that.
>>
>>      ... for suitable values of "fix."
>>
>>      JLS 15.10.1, Array Creation Expressions: "It is a compile-time
>> error if the ClassOrInterfaceType does not denote a reifiable type."
>
> Ooops.
>
> You are right.
>
> That does not work.

     Alas, no.  A continuing and damnable annoyance.

> One of the ugly cast and suppress solutions are necessary.

     Lew's dodge using a variadic function is nice.  Nicer than
casts, anyhow, because it retains type safety.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM