ditto on Effective Java, its a MUST READ
(When Gosling says this book was useful to him (comments on back of
book)... it says something)
mark
"John Owen" <[EMAIL PROTECTED]> on 11/21/2002 10:13:04 AM
Please respond to "Struts Users Mailing List"
<[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
cc:
Subject: Re: [OT] How to tell when a project you are on is in trouble
According to "Effective Java", it is a better practice to throw an
exception
rather than return null. This book makes for good reading.
----- Original Message -----
From: "Vilya Harvey" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Thursday, November 21, 2002 10:06 AM
Subject: Re: [OT] How to tell when a project you are on is in trouble
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
>
> > Call me crazy, but I can see how this may be useful.
>
> You're crazy. :-)
>
> > NullPointerException on its own subclasses RuntimeException. This means
> > that you are not required to "catch" runtime exceptions or declare them
> > with a "throws" clause of a method.
>
> Bruce Eckel (author of "Thinking in Java") posted an interesting article
on
> his website a short while back, discussing whether checked exceptions in
> general are actually a good idea. The article is at
> http://www.mindview.net/Etc/Discussions/CheckedExceptions
> if you're interested. I'm still not sure whether I agree with the authors
> conclusions, but it's interesting to think about.
>
> > But there are times where having an object be null may have a meaning
> other
> > than a bug in the code - for example you may read from some third-party
> > library that returns a null object as a valid response. If that
happens,
> > you may need to catch it or declare it in a throws clause.
> > NullPointerException won't enforce this becaue it subclasses
> > RuntimeException.
>
> I can see where you're coming from with this, but if null is a valid
return
> value then surely that means it's not an exceptional condition? In that
> case, the right thing to do is to check whether the return value is null
> rather than waiting for an exception to be thrown...
>
> Cheers,
> Vil.
> --
> Vilya Harvey, Consultant
> [EMAIL PROTECTED] / digital steps /
> (W) +44 (0)1483 469 480
> (M) +44 (0)7816 678 457 http://www.digitalsteps.com/
>
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