File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Beginning Java and the fly likes Numeric Null Comparison Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Numeric Null Comparison" Watch "Numeric Null Comparison" New topic

Numeric Null Comparison

Marc LeClerc

Joined: May 10, 2007
Posts: 14
I have the following if statement which is gagging on me:

The not null condition works fine, but when trying to see if both are null,
the IDE gives me the following

The operator type && is undefined for the argument type(s) null, boolean

I am VERY new to java and am just trying to tweak some existing code for a vacationing colleague.

Any and all help appreciated.
Paul Sturrock

Joined: Apr 14, 2004
Posts: 10336

This looks suspect:

are those single equals? If they are you are trying to do assignment, not checking their value.
[ April 21, 2008: Message edited by: Paul Sturrock ]

JavaRanch FAQ HowToAskQuestionsOnJavaRanch
Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

Yes, use "==" for comparison, not '='.

[Jess in Action][AskingGoodQuestions]
Ravikanth kolli
Ranch Hand

Joined: Feb 10, 2008
Posts: 179

are num1 and num2 integers as the topic says numeric null comparision?

Marc LeClerc

Joined: May 10, 2007
Posts: 14
Yes they are integers, the == seemed to have fixed it.

Thanks for not pouncing on the newbie !
Bill Shirley
Ranch Hand

Joined: Nov 08, 2007
Posts: 457
Yes, you're comparisons are faulty, but that will just make it work incorrectly once you get it compiled.

It's not compiling, because you're missing a set of parentheses.

Bill Shirley - bshirley -
if (Posts < 30) JavaRanchFAQ);
I agree. Here's the link:
subject: Numeric Null Comparison
It's not a secret anymore!