Groups > comp.lang.java.programmer > #9007

Re: Cannot create a generic array of <type>

From	markspace <-@.>
Newsgroups	comp.lang.java.programmer
Subject	Re: Cannot create a generic array of <type>
Date	2011-10-19 12:21 -0700
Organization	A noiseless patient Spider
Message-ID	<j7n7vs$266$1@dont-email.me> (permalink)
References	<j7lic6$lob$1@speranza.aioe.org> <11633107.472.1319005728890.JavaMail.geo-discussion-forums@prfp13> <j7m7nv$766$4@speranza.aioe.org> <j7mdic$67e$1@dont-email.me> <j7muo9$6oj$1@speranza.aioe.org>

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On 10/19/2011 9:43 AM, Warren Tang wrote:
> On 10/19/2011 7:50 PM, markspace wrote:
>> On 10/19/2011 3:11 AM, Warren Tang wrote:
>>> Thanks for the info. If I use the reified version of the generic - i.e.
>>> the erased version of the generic - ArrayList instead of
>>> ArrayList<Integer>, the compile error goes away and there is no run-time
>>> error either.
>>>
>>> ArrayList<Integer>[] indexedValues = new ArrayList[5];
>>>
>>> Although there is still a type safety warning.

Because what you did is not type safe.  It's also a terrible idea and 
poor practice.  Bosses and co-workers will not like this sort of thing.

> Sure. I just wanted to know why.

What you have there is not the reified version of a generic.  It's a raw 
type.  It has no parameter type.  It's a really bad idea to use raw 
types or to mix raw types and generics unless you must (there are a few 
specific instances where you can't avoid it).  Here, you can almost 
certainly avoid raw types so do so.

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Thread

Cannot create a generic array of <type> Warren Tang <nospam@tangcs.com> - 2011-10-19 12:06 +0800
  Re: Cannot create a generic array of <type> Warren Tang <nospam@tangcs.com> - 2011-10-19 13:22 +0800
  Re: Cannot create a generic array of <type> Lew <lewbloch@gmail.com> - 2011-10-18 23:28 -0700
    Re: Cannot create a generic array of <type> Warren Tang <nospam@tangcs.com> - 2011-10-19 18:11 +0800
      Re: Cannot create a generic array of <type> markspace <-@.> - 2011-10-19 04:50 -0700
        Re: Cannot create a generic array of <type> Warren Tang <nospam@tangcs.com> - 2011-10-20 00:43 +0800
          Re: Cannot create a generic array of <type> markspace <-@.> - 2011-10-19 12:21 -0700
            Re: Cannot create a generic array of <type> Warren Tang <nospam@tangcs.com> - 2011-10-21 11:05 +0800
      Re: Cannot create a generic array of <type> Lew <lewbloch@gmail.com> - 2011-10-19 10:00 -0700

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