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 ArrayList throws Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "ArrayList throws " Watch "ArrayList throws " New topic

ArrayList throws

santoshkumar savadatti
Ranch Hand

Joined: Apr 27, 2010
Posts: 95
Hi all.
I am still a greenhorn.I wrote the following program:

As far as i can see, there's no problem (but then I'm greenhorn )
But when i run the code, it displays numbers at each position as expected.But it also displays the following message:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 8, Size: 8
at java.util.ArrayList.RangeCheck(
at java.util.ArrayList.get(

and its displayed for different index every time.Sometimes for Index 4 and sometimes for Index 8.
at org.testSample3.example.ListClass.main(
Wouter Oet
Saloon Keeper

Joined: Oct 25, 2008
Posts: 2700

The for-each loop will iterate through the values of your list and assign the value to i.
So i get's the values of the elements in your list. Then you try to get the element of the
list at the index of i. And since your list contains a bigger value then the list size it
throws an IndexOutOfBoundsException because you're trying to acces element number 9
when there are only 8 elements.

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand." --- Martin Fowler
Please correct my English.
santoshkumar savadatti
Ranch Hand

Joined: Apr 27, 2010
Posts: 95
Thank You very much wouter.
I actually thought i does not contain the value at that iteration but the "index" for that iteration.
Thnks again.I modified the program and now it runs perfectly
Just used a different variable int pos =0 and for-each loop required just a small modification:

I agree. Here's the link:
subject: ArrayList throws
It's not a secret anymore!