How to add element at a specific position in ArrayList while sorting using Arraylist?

I want to add an integer value at a specific position in an ArrayList but after doing so it pushes at last element to its next index, as i am doing sorting i do not want it to happen. Help me with a snippet of code to write bubble sort using ArrayList.

My code

void bubble_sorting(ArrayList<Integer> arr){
    int swap;
    for(int i=0;i<5-1;i++){
        for(int j=0;j<5-i-1;j++){
            if(arr.get(j)>arr.get(j+1)){
                swap = arr.get(j);
                arr.add(j,arr.get(j+1));
                arr.add(j+1,swap);
            }
        }
    }
}

and after passing ArrayList [23,54,67,4,5]

I get this as output: [4, 23, 23, 4, 54, 54, 4, 67, 67, 4, 5]