Sorting of ArrayList

Question

I have one array list

ArrayList itemListWithRank = ItemListDAO.getItemList();

and in arraylist itemListWithRank there are lot

Answer 1

Collections.sort(itemListWithRank ,new Comparator() {

    public int compare(Person o1, Person o2) {
        return Integer.valueOf(o1.id).compareTo(Integer.valueOf(o2.id));
    }
});