Calendar Comparator : Comparator Interface « Collections « Java Tutorial

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3. Comparator Interface

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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();

}