This week's book giveaways are in the iOS and Features new in Java 8 forums.
We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line!
See this thread and this one for details.
The moose likes Beginning Java and the fly likes Null Values? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Barcodes with iOS this week in the iOS forum
or Core Java for the Impatient in the Java 8 forum!

JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Null Values?" Watch "Null Values?" New topic
Author

Null Values?

Sam Bluesman
Ranch Hand

Joined: Nov 21, 2004
Posts: 191


I keep getting a 'null value' in the allActivitiesLecturerLookupField[counter] memory locations instead of a lecturer's name. Why is this? All arrays have the correct information in them. What is wrong with my code?

[ February 07, 2006: Message edited by: Sam Bluesman ]
[ February 07, 2006: Message edited by: Sam Bluesman ]

Moosey knows best
Martin Mathis
Ranch Hand

Joined: Dec 20, 2004
Posts: 45
Have you tried using a debugger or output statements so that you can actually see how things are running? I'd assume that the if statement never evaluates to true, so you're left with the initial null values.
Sam Bluesman
Ranch Hand

Joined: Nov 21, 2004
Posts: 191
Yes it prints out null 5 times. But i dont understand why.
Chris Allen
Ranch Hand

Joined: Feb 01, 2003
Posts: 127

Unless the two objects point to the same reference in memory, the expression will always be false and hence, never assign the value. I am guessing you want to use the .equals() method instead of == to test whether the objects are equivalent (data-wise) rather than pointing to the same reference in memory.
Sam Bluesman
Ranch Hand

Joined: Nov 21, 2004
Posts: 191
how do i use .equals() in this context?
Sam Bluesman
Ranch Hand

Joined: Nov 21, 2004
Posts: 191
Forget the last post. Thank you very much people!
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Null Values?