This week's book giveaway is in the Android forum.
We're giving away four copies of Head First Android and have Dawn & David Griffiths on-line!
See this thread for details.
The moose likes Beginning Java and the fly likes NullPointerException Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Head First Android this week in the Android forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "NullPointerException" Watch "NullPointerException" New topic
Author

NullPointerException

Joel Christophel
Ranch Hand

Joined: Apr 20, 2011
Posts: 245
    
    1





It compiles, but I get a NullPointerException, Why in the world is this happening?
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 43377
    
  32
Very common error. You create an array, which contains 300 nulls, until you assign something to them. Maybe you can iterate through the array and assign them all like this
myArray[i] = new Foo(...);


Remember: a newly-created array is implicitly full of nulls, until you put something in their place.
Claudiu Chelemen
Ranch Hand

Joined: Mar 25, 2011
Posts: 71

It's because you declared an array of elements, but no elements are inside it. Afterwards, you're trying to call the set methods on two objects that aren't there...

Claudiu
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: NullPointerException
 
It's not a secret anymore!