Groups > comp.lang.java.programmer > #9789

Re: Abstract Class versus an Interface, when no Members in Common

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From	Wanja Gayk <brixomatic@yahoo.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: Abstract Class versus an Interface, when no Members in Common
Date	Tue, 8 Nov 2011 23:15:33 +0100
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In article <3iYsq.9363$zi2.7579@newsfe10.iad>, 
newsgroup.nospam@virtualinfinity.net says...

> Sounds almost like you want a visitor pattern instead, or an 
> intermediate object:
> 
> public class SearchResult {
>     public boolean isSingleArray() { ... }
>     public boolean isMultipleArray() { ... }
> 
>     // Throws IllegalStateException if !isSingleArray
>     public SingleArray getSingleArray() { ... }
>     // Throws IllegalStateException if !isMutipleArray
>     public MultipleArray getMultipleArray() { ... }
> 
> }

That doesn't seem to be any better than the infamous instaceof-cascade - 
I'd rather say it's even uglier.

Kind regards,
-Wanja-


-- 
..Alesi's problem was that the back of the car was jumping up and down 
dangerously - and I can assure you from having been teammate to 
Jean Alesi and knowing what kind of cars that he can pull up with, 
when Jean Alesi says that a car is dangerous - it is. [Jonathan Palmer]

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Abstract Class versus an Interface, when no Members in Common KevinSimonson <kvnsmnsn@hotmail.com> - 2011-11-03 16:09 -0700
  Re: Abstract Class versus an Interface, when no Members in Common Arne Vajhøj <arne@vajhoej.dk> - 2011-11-03 19:32 -0400
  Re: Abstract Class versus an Interface, when no Members in Common markspace <-@.> - 2011-11-03 17:37 -0700
    Re: Abstract Class versus an Interface, when no Members in Common Lew <lewbloch@gmail.com> - 2011-11-03 18:10 -0700
      Re: Abstract Class versus an Interface, when no Members in Common markspace <-@.> - 2011-11-03 18:46 -0700
  Re: Abstract Class versus an Interface, when no Members in Common Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 22:06 -0700
  Re: Abstract Class versus an Interface, when no Members in Common Ian Pilcher <arequipeno@gmail.com> - 2011-11-04 00:06 -0500
  Re: Abstract Class versus an Interface, when no Members in Common Robert Klemme <shortcutter@googlemail.com> - 2011-11-04 17:57 +0100
  Re: Abstract Class versus an Interface, when no Members in Common Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-04 13:54 -0700
    Re: Abstract Class versus an Interface, when no Members in Common Wanja Gayk <brixomatic@yahoo.com> - 2011-11-08 23:15 +0100
      Re: Abstract Class versus an Interface, when no Members in Common Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-08 20:58 -0800
  Re: Abstract Class versus an Interface, when no Members in Common Roedy Green <see_website@mindprod.com.invalid> - 2011-11-04 15:17 -0700
  Re: Abstract Class versus an Interface, when no Members in Common Wanja Gayk <brixomatic@yahoo.com> - 2011-11-08 23:13 +0100

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