package lazyj.mail.comparators;import java.io.Serializable;import java.util.Comparator;import lazyj.mail.MailDate;import lazyj.mail.MailHeader;/** * A MailHeader comparator that sorts the mails by the sending date. *  * @author costing * @since 2006-10-13 */public class DateComparator implements Comparator<MailHeader>, Serializable {	private static final long	serialVersionUID	= -5048796807009198965L;		/**	 * Sorting method : by the date in the header 	 * 	 * @param o1 first mail	 * @param o2 second mail	 * @return sending dates compared result (see {@link MailDate#compareTo(MailDate)})	 */	public int compare(MailHeader o1, MailHeader o2) {		return o1.mdDate.compareTo(o2.mdDate);	}}