NVL IsNull equivilent in Java? (Null handling)

[DiggidyMack69]

Hello all,
I was wondering if there a method/function etc that is simular to
Oracle's Nvl function. The funtion checks a parameter and if it is
null then is will output a given alternative. i.e. nvl(parameter1,
value1) if parameter1 is null then send value1.
I have a servlet with the following snippet of code that I'd like to
streamline as this is one of many checks to be made...ideas?


if(request.getP arameter("idcol ")!= null)
{
int idcol = Integer.parseIn t(request.getPa rameter("idcol" ).trim());
}else{
int idcol = 0;
}

[Steve Lieberman]

Re: NVL IsNull equivilent in Java? (Null handling)

DiggidyMack69@h otmail.com (DiggidyMack69) wrote in message news:<c86ce4f.0 308111305.3b776 f40@posting.goo gle.com>...[color=blue]
> Hello all,
> I was wondering if there a method/function etc that is simular to
> Oracle's Nvl function. The funtion checks a parameter and if it is
> null then is will output a given alternative. i.e. nvl(parameter1,
> value1) if parameter1 is null then send value1.[/color]

There's nothing directly equivalent to that function. However, there are
two alternatives:

(1) Using the tertiary operator (also used in C/C++)

The expression: <condition> ? <a> : <b>
evaluates to <a> if <condition> is true or <b> if condition is
false.

Your snippet could be rewritten as:
int idcol = (request.getPar ameter("idcol") != null) ?
Integer.parseIn t(request.getPa rameter("idcol" ).trim()) : 0;

(2) Writing the function you're looking for yourself and putting it in
some static function in a utility class.

Steve

[DiggidyMack69]

Re: NVL IsNull equivilent in Java? (Null handling)

sl@digilevel.co m (Steve Lieberman) wrote in message news:<beef3a29. 0308120855.2953 f1e1@posting.go ogle.com>...[color=blue]
> DiggidyMack69@h otmail.com (DiggidyMack69) wrote in message news:<c86ce4f.0 308111305.3b776 f40@posting.goo gle.com>...[color=green]
> > Hello all,
> > I was wondering if there a method/function etc that is simular to
> > Oracle's Nvl function. The funtion checks a parameter and if it is
> > null then is will output a given alternative. i.e. nvl(parameter1,
> > value1) if parameter1 is null then send value1.[/color]
>
> There's nothing directly equivalent to that function. However, there are
> two alternatives:
>
> (1) Using the tertiary operator (also used in C/C++)
>
> The expression: <condition> ? <a> : <b>
> evaluates to <a> if <condition> is true or <b> if condition is
> false.
>
> Your snippet could be rewritten as:
> int idcol = (request.getPar ameter("idcol") != null) ?
> Integer.parseIn t(request.getPa rameter("idcol" ).trim()) : 0;
>
> (2) Writing the function you're looking for yourself and putting it in
> some static function in a utility class.
>
> Steve[/color]


Much cleaner, thanks!!