Sorting an ArrayList of objects using a custom sorting order

Question

I am looking to implement a sort feature for my address book application.

I want to sort an ArrayList contactArray. Contact

Answer 1

use this method:

private ArrayList sortList(ArrayList list) {
    if (list != null && list.size() > 1) {
        Collections.sort(list, new Comparator() {
            public int compare(myClass o1, myClass o2) {
                if (o1.getsortnumber() == o2.getsortnumber()) return 0;
                return o1.getsortnumber() < o2.getsortnumber() ? 1 : -1;
            }
        });
    }
    return list;
}

`

and use: mySortedlist = sortList(myList); No need to implement comparator in your class. If you want inverse order swap 1 and -1