Compare date with implements Comparator

Question

I have a DefaultListModel (mode) staffed with EMPL (id, name, startingDate). I would like to sort the defaultListModel accourding to the dob. for this I do the following:
               Object[] contents = model.toArray();               
               Arrays.sort(contents, new ComparatorDate());
               model.copyInto(contents);the comparator: ComparatorDate
public class ComparatorDate implements Comparator
     public int compare(Object o1, Object o2)
          Empl a = (Empl ) o1;
          Empl b = (Empl ) o2;
          Date d1 = a.getStartDate();
          Date d2 = b.getStartDate();
          return (d1.getDate()-d2.getDate());
}when debugging I realize the dates are diff but the d1.getDate()=1 and d2.getDate()=1 ??? how come? the result are not what expected.
any idea?

Answer 1

getDate() tells you the day of the month. Both your dates are apparently on the first of some month. Since Date implements Comparable, why not just do return d1.compareTo(d2)