"None" <none@none.com> wrote in message
news:3b7v72tudiluo3rmrpbfatme1tu6v13foe@4ax.com...[color=blue]
> Dynamic array creation
>
> Hi all... here's a good one for you...
>
> I have a situation where I have some bean, and I need to populate an
> array field in it... here's the problem... I do not know the element
> type of the array before runtime.
>
> Now, I've been planning on using Commons Beanutils, since the rest of
> this particular app does (it's doing a lot of introspection of the
> beans and such).
>
> So, here's the question... can anyone figure out a way to dynamically
> create an array at runtime? What I mean is, I want to do the
> followig:
>
> PropertyUtils.setProperty(obj, fieldName,
> ((List)fieldValues).toArray());
>
> So, I want to set the field named by fieldName on the bean instance
> referenced by obj, and I want to do it by taking the fieldValues List
> and converting it to an array. Now, I can do:
>
> PropertyUtils.setProperty(obj, fieldName,
> ((List)fieldValues).toArray(new String[0]));
>
> ...and that's great, except that I don't know until runtime that the
> field of the bean is of type String, it could be anything else. So,
> how can I dynamically do the equivalent of the new String[0] is really
> the question?
>
> FYI, I don't really care if this is done with Beanutils, but I think
> that's probably the logical course of action. Any ideas? Thanks all![/color]
Use the Array.newInstance(Class, int) method:
http://java.sun.com/j2se/1.5.0/docs/...g.Class,%20int)
(note that there's a close parenthesis at the end that's part of this URL).
- Oliver
