On 2009-11-21, at 10:23 AM, Shravan Kumar. M wrote:
> Hello Group,
>
> Boolean a = null;
> if(a != null)
> System.out.println("s");
> else
> System.out.println("n");
>
> ----------
> Above code block raises NullPointerException, where as below one runs
> successfully!!! Same is the case with any wrapper class (Integer, Long, ...).
> *Its wondering what it makes difference in checking (a != null) and (a ==
> null)? Its just an Object check rt!*
>
> Exact exception: java.lang.NullPointerException at booleanValue()
> ----------
>
> Boolean a = null;
> if(a == null)
> System.out.println("s");
> else
> System.out.println("n");
That makes no sense.
Boolean b = null;
if (b != null) {
NSLog.out.appendln("not null");
} else {
NSLog.out.appendln("is null");
}
Runs fine for me.
Something is hosed with your JVM?
;david
--
David LeBer
Codeferous Software
'co-def-er-ous' adj. Literally 'code-bearing'
site: http://codeferous.com
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--
Toronto Area Cocoa / WebObjects developers group:
http://tacow.org
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