How to move specific item in array list to the first item

Solution 1:

What you want is a very expensive operation in an ArrayList. It requires shifting every element between the beginning of the list and the location of C down by one.

However, if you really want to do it:

int index = url.indexOf(itemToMove);
url.remove(index);
url.add(0, itemToMove);

If this is a frequent operation for you, and random access is rather less frequent, you might consider switching to another List implementation such as LinkedList. You should also consider whether a list is the right data structure at all if you're so concerned about the order of elements.

Solution 2:

Do this:

1. Remove the element from the list: ArraylistObj.remove(object);
2. Add the element back to the list at specific position: ArrayListObj.add(position, Object);

As per your code use this :

url.remove("C");
url.add(0,"C");