Calendar Comparator : Comparator Interface « Collections « Java Tutorial

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import java.util.Calendar;
import java.util.Comparator;

 * @author Gavin King
public class CalendarComparator implements Comparator {

  public int compare(Object x, Object y) {
    Calendar xcal = (Calendar) x;
    Calendar ycal = (Calendar) y;
    if ( xcal.before(ycal) ) return -1;
    if ( xcal.after(ycal) ) return 1;
    return 0;
  public static final Comparator INSTANCE = new CalendarComparator();


9.40.Comparator Interface
9.40.1.System-Defined Comparable Classes
9.40.2.Writing Your own Comparator
9.40.3.Getting reverse order comparator
9.40.4.Implementing a Comparator for a class
9.40.5.Use a custom comparator.
9.40.6.Sort an array of strings in reverse order.
9.40.7.Sort an array of strings, ignore case difference.
9.40.8.Use a comparator to sort accounts by last name.
9.40.9.Comparator uses a Collator to determine the proper, case-insensitive lexicographical ordering of two strings.
9.40.10.Calendar Comparator
9.40.11.Invertible Comparator