Q:

Ordering an ArrayList with bubble sort

I'm trying to order an  Arraylist which contains BigDecimal value of money from the largest to the smallest.
That's my code:
 public void bubble_sort(ArrayList<String> nameArray, ArrayList<BigDecimal> priceArray){
    for (int i = 0; i < priceArray.size(); i++){
        for (int j = 0; j < priceArray.size() - 1; j++){
            if (priceArray.indexOf(j) > priceArray.indexOf(j+1)){
                int temp = priceArray.indexOf(j);
                priceArray.set(j, priceArray.get(j+1));
                priceArray.set(j+1, BigDecimal.valueOf(temp));
            }
        }
    }
    Log.v("Ordering array", priceArray.toString());

}

But the order is still the same of the original array.
What should I do?

A:

You are comparing the indices instead of the values.
Change this
if (priceArray.indexOf(j) > priceArray.indexOf(j+1)){
    int temp = priceArray.indexOf(j);
    priceArray.set(j, priceArray.get(j+1));
    priceArray.set(j+1, BigDecimal.valueOf(temp));
}

to
if (priceArray.get(j).compareTo(priceArray.get(j+1) > 0){
    BigDecimal temp = priceArray.get(j);
    priceArray.set(j, priceArray.get(j+1));
    priceArray.set(j+1, temp);
}

