Sorting java collection

Java uses the Merge sorting algorithm to sort collection. We can sort java collections using the java.util.Collections.sort() method. This method applies for List'collection type:

- List

- LinkedList

Natural Sorting:

List list = new ArrayList();
//add elements to the list

Collections.sort(list);

Sorting uses a Comparator

List<CustomObject> list = new ArrayList<CustomObject>();
Comparator<CustomObject> comparator = new Comparator<CustomObject>() {
    public int compare(CustomObject c1, CustomObject c2) {
        return c2.getYourField() - c1.getYourField(); // use your logic    }
};

Collections.sort(list, comparator);