Re: Handling same exceptions in different functions

From:

Patricia Shanahan <pats@acm.org>

Newsgroups:

comp.lang.java.help

Date:

Thu, 04 Mar 2010 16:06:17 -0800

Message-ID:

<_JOdnQpUFr1m1w3WnZ2dnUVZ_tCdnZ2d@earthlink.com>

Merciadri Luca wrote:

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Thanks for both answers. I learnt new stuff. However, I cannot post an
example, because this is for a uni project. Let's say that I have two
methods f1 and f2, public, which return nothing. They all share the
same exception specialException. I then use

public void f1 (...) throws specialException {

}

and

public void f2 (...) throws specialException {

}

and the same but without any content for the signatures.

Okay, but, using this scheme, I am obliged to type twice the code to
execute once specialException has been encountered. Is it possible to
do this in another way?

Furthermore, how can I implement f1 and f2 if the only code they have
is the code which is only related to the exception they throw?

....

I am not sure I understand your question, but if f1 and f2 need to do
identical tests, I would put the test in its own method:

public void f1(int a) throws SpecialException {
   rangeCheck(a);
}

public void f1(int b) throws SpecialException {
   rangeCheck(b);
}

private void rangeCheck(int x) throws SpecialException {
   if(x < 0 || x > 100) {
     throw new SpecialException(x + " is out of range");
   }
}

You can also factor out common code for the body of your catch handling:

try {
  ...
} catch (SpecialException e){
   specialExceptionProcessing(e);
}

Patricia