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Re: When to throw exceptions and when to use System.err?

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David Lamb wrote:
> - You need to figure out an appropriate exception to use for "number not in
> the right range". If you want to go whole hog you could define your own

It's best to use a standard one for this type of exception.  At the very 
least, inherit from 'RuntimeException' - for this particular mistake I'd use 
'IllegalArgumentException' or 'IndexOutOfBoundsException', though the mistake 
isn't exactly about an index.

You could also subtype 'IllegalArgumentException' or 'NumberFormatException' 
to distinguish the range problem:

  public class RangeException extends IllegalArgumentException
  {
    public RangeException() {}
    public RangeException( String s ) { super( s ); }
    public RangeException( Throwable cause ) { super( cause ); }
    public RangeException( String s, Throwable cause ) { super( s, cause ); }
  }

> exception that included the value read and the upper/lower bounds you were
> looking for (e.g. 1 and Integer.MAX_VALUE), which would be plenty for a caller
> to use in producing a fully informative and localized user message (which you
> could even provide via your exception class's getLocalizedMessage method). Or
> you might find some existing exception to be good enough.
>


-- 
Lew
overhead at an apartment where the super was evicting a tenant:
super: cause afraid your lease took acts - be y'all who do' shuts out, Mary 
Poppins.

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Re: When to throw exceptions and when to use System.err? David Lamb <dalamb@cs.queensu.ca> - 2011-03-29 07:29 -0400
  Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-29 11:21 -0400
    Re: When to throw exceptions and when to use System.err? David Lamb <dalamb@cs.queensu.ca> - 2011-03-29 18:38 -0400
      Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-29 18:53 -0400
        Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-03-30 11:48 -0700
          Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-30 23:49 -0400
            Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-30 23:52 -0400
            Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-03-31 06:55 -0700
              Re: When to throw exceptions and when to use System.err? Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-03-31 15:58 +0100
                Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-03-31 09:02 -0700
                Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-31 19:57 -0400
              Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-03-31 19:50 -0400
                Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-04-01 10:44 -0700
                Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-04-01 19:52 -0400
                Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-04-04 08:47 -0700
                Re: When to throw exceptions and when to use System.err? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-04 13:40 -0400
                Re: When to throw exceptions and when to use System.err? Eric <e.d.programmer@gmail.com> - 2011-04-04 11:56 -0700
                Re: When to throw exceptions and when to use System.err? Lew <noone@lewscanon.com> - 2011-04-06 12:40 -0400

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