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

Question

For example : A list

A B C D E

Given C , Switch to

C A B D E

Notice that the array size will change, some items may removed in run times

Answer 1

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");