Question

I need to sort an ArrayList and i can’t use Collections.sort(), because Google App Engine’s Java runtime environment doesn’t support it. How can I do? Thanks! ^^

Answer 1

If your ArrayList has NO DUPLICATE VALUES….. and i am assuming even if it had, you didnt wanted to have redundant data..so its better to use TreeSet and Comparator together…

Eg:

ArrayList<MyObject> arr = new ArrayList<MyObject>();

TreeSet<MyObject> t = new TreeSet<MyObject>(Comparator c);

t.addAll(arr);