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

Let say you have an array:

String[] arrayOne = new String[]{"A","B","C","D","E"};

Now you want to place the C at index 0 get the C in another variable

String characterC = arrayOne[2];

Now run the loop like following:

for (int i = (2 - 1); i >= 0; i--) {

            arrayOne[i+1] = arrayOne[i];
        }

Above 2 is index of C. Now insert C at index for example on 0

arrayOne[0] = characterC;

Result of above loop will be like that:

arrayOne: {"C","A","B","D","E"}

The end, we achieve our goal.