Java (Android) re-ordering an object list

Question

I read the documentation on this, and I'm not totally clear. I've zeroed in on the set method and I'm thinking that I would do reordering like this:

list.set(0,myObj);//Move first
list.set(list.indexOf(myObj) - 1, myObj);//Move up
list.set(list.indexOf(myObj) + 1, myObj);//Move down
list.set(list.size() - 1, myObj);//Move last

The documentation at http://developer.android.com/reference/java/util/List.html states that set returns the object that is displaced. So that leads me to think that I then have to re-place that object. Am I correct? So after a set operation as I described I would have two references to the object in the list. This would mean I'd have to loop down the list to place all the other object appropriately?

Answer 1

Use Collection class's swap() for it

swap(List list, int i, int j)

Swaps the elements at the specified positions in the specified list.

Example:

Collections.swap(arrayList,0,4);