Using compareTo and Collections.sort

Question

I have a franchise class with owner(owner of franchise\'s name), state(2-character string for the state where the franchise is located), and sales (total sales for the day)<

Answer 1

Comparable will give only one way of comparision. This can be done using Comparator interface.

Collections.sort(list, new Comparator() {
@Override
            public int compare(Franchise obj1, Franchise obj2) {
                if(obj1.getState().compareTo(obj2.getState()) == 0)
                {
                    Double a1 =obj1.getSales();
                    Double a2 = obj2.getSales();
                    return a2.compareTo(a1);
                }

                    return o1.getName().compareTo(o2.getName());
        } 
}