Adding an item to arrayList at a specific index

Hi, Im trying to add an element to a specific index in an ArrayList
I know for an arrayList if you want to add an element to a specific place you do write arraylist.add(1, 5) to add 5 to position 1, but do you know how to put a variable name in instead of a number.

I tried arrayList.add(count, 5) where count equals an integer but I keep getting an out of bounds exception

Count will constantly change and i need to add the elements to the index which equals it.

Any help would be greatly appreciated

Thank you very much :)

ArrayList.add
->
Throws:
IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())

If the size of your ArrayList is lower than count, you will get this exception!

Example: You can not invoke add(3,1337) if your ArrayList has only one element in it! (Index: 3, Size: 1)

Btw: size = the number of elements in this list (not the initialCapacity!!!!)

Thank you soo much!!
I just initalised all the elements in my arrayList to 0 and then did it and it worked!!!

:D