arraylist vs. array?

Hi

I am new to Java and would appreciate it if some one could explain difference between an arraylist and a simple (1 or 2 diminsional) array. Also, when would you use the arraylist as apposed to the array. Thanks - Ronnie

Someone else recently had the same question.

forums.javaboutique.internet.com/showthread.php?s=&threadid=1997

Thanks Steven. I think I need the Array List becuase I am not certain of the number of variables in my array.

Ronnie