Java - get element position in array

Question

I\'m familiar with the ways I can get an element position in array, especially the ones showed here: Element position in array

But my problem is I can\'t figure out

Answer 1

use the indexof method to get the position -

listPackages.indexOf(current_package)

http://download.oracle.com/javase/1.4.2/docs/api/java/util/ArrayList.html#indexOf(java.lang.Object)