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As I am aware, it is required to use equals() method(and not '==') for
equality comparision of two String objects.
But, what exactly is recommended for 'null' check?
if( stringObj == null )
or
if( stringObj.equals( null ) )

wrote:
> As I am aware, it is required to use equals() method(and not '==') for
> equality comparision of two String objects.
> But, what exactly is recommended for 'null' check?
> if( stringObj == null )
> or
> if( stringObj.equals( null ) )
>
If stringObj is null, then the second one (using .equals) will
throw a NullPointerException, because you are attempting to
dereference a null pointer. So, the first one should be used.

wrote:
> As I am aware, it is required to use equals() method(and not '==') for
> equality comparision of two String objects.
> But, what exactly is recommended for 'null' check?
> if( stringObj == null )
> or
> if( stringObj.equals( null ) )
>

A String object cannot be null, only a String reference can be null.
You are testing if the String reference is null, so ...
Anyway, if stringObj was null the equals() version would throw a NPE...

stringObj == null

On 29 Mar 2006 01:08:56 -0800, wrote, quoted
or indirectly quoted someone who said :

>But, what exactly is recommended for 'null' check?
>if( stringObj == null )
>or
>if( stringObj.equals( null ) )

the first is preferred. The second would likely like blow up with a
null pointer exception since people don't always defend against sort
of thing.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

"Roedy Green" < > wrote in
message news...
> On 29 Mar 2006 01:08:56 -0800, wrote, quoted
> or indirectly quoted someone who said :
>
>>But, what exactly is recommended for 'null' check?
>>if( stringObj == null )
>>or
>>if( stringObj.equals( null ) )
>
> the first is preferred. The second would likely like blow up with a
> null pointer exception since people don't always defend against sort
> of thing.

That is, the second one will always NPE is stringObj is null, and possibly
even if it isn't.