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Programming > Java Help > Re: return a Co...
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Re: return a Collection (Set or List)

by Roedy Green <see_website@[EMAIL PROTECTED] > May 13, 2008 at 12:40 PM

On Tue, 13 May 2008 11:29:57 GMT, thufir <hawat.thufir@[EMAIL PROTECTED]
>
wrote, quoted or indirectly quoted someone who said :

>found   : java.util.Collection<a00720398.data.Guest>
>required: java.util.List<a00720398.data.Guest>
>        guests = console.scanFile(new File("Guests.txt"), new
GuestFactory
>());
>                                 ^

All Lists are Collections but not all Collections are Lists.  Java
insists on an explicit cast when the conversion might conceivably
fail, e.g. Collection -> List.

You need to have your method return a List<Guest> or you need to cast
the assignment with:  

guests  = (List <Guest>)xxxx;
-- 

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
 




 11 Posts in Topic:
return a Collection (Set or List)
thufir <hawat.thufir@[  2008-05-13 11:29:57 
Re: return a Collection (Set or List)
Lew <lew@[EMAIL PROTEC  2008-05-13 08:18:51 
Re: return a Collection (Set or List)
Roedy Green <see_websi  2008-05-13 12:40:58 
Re: return a Collection (Set or List)
Mark Space <markspace@  2008-05-13 11:37:53 
Re: return a Collection (Set or List)
Roedy Green <see_websi  2008-05-13 19:39:07 
Re: return a Collection (Set or List)
Eric Sosman <Eric.Sosm  2008-05-13 16:13:07 
Re: return a Collection (Set or List)
Lew <lew@[EMAIL PROTEC  2008-05-13 19:41:37 
Re: return a Collection (Set or List)
Roedy Green <see_websi  2008-05-14 08:22:59 
Re: return a Collection (Set or List)
thufir <hawat.thufir@[  2008-05-13 22:38:12 
Re: return a Collection (Set or List)
RedGrittyBrick <RedGri  2008-05-14 10:27:23 
Re: return a Collection (Set or List)
Lew <lew@[EMAIL PROTEC  2008-05-14 08:07:30 

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tan12V112 Wed Jul 9 7:16:58 CDT 2008.