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/* ¸ßÊÖÖ®×÷£¬±¾È˽÷ÒÔÊÕ²ØÕßÉí·Ý¹²ÏíÔ´Â룬¹©´ó¼Ò²Î¿¼Ö®! */
/*
 * ÁбíADT½Ó¿Ú
 */
package dsa;
public interface List {
//²éѯÁÐ±íµ±Ç°µÄ¹æÄ£
 public int getSize();
//ÅжÏÁбíÊÇ·ñΪ¿Õ
 public boolean isEmpty();
//·µ»ØµÚÒ»¸öÔªËØ£¨µÄλÖã©
 public Position first();
//·µ»Ø×îºóÒ»¸öÔªËØ£¨µÄλÖã©
 public Position last();
//·µ»Ø½ô½Ó¸ø¶¨Î»ÖÃÖ®ºóµÄÔªËØ£¨µÄλÖã©
 public Position getNext(Position p)
 throws ExceptionPositionInvalid, ExceptionBoundaryViolation;
//·µ»Ø½ô¿¿¸ø¶¨Î»ÖÃ֮ǰµÄÔªËØ£¨µÄλÖã©
 public Position getPrev(Position p)
 throws ExceptionPositionInvalid, ExceptionBoundaryViolation;
//½«e×÷ΪµÚÒ»¸öÔªËزåÈëÁбí
 public Position insertFirst(Object e);
//½«e×÷Ϊ×îºóÒ»¸öÔªËزåÈëÁбí
 public Position insertLast(Object e);
//½«e²åÈëÖÁ½ô½Ó¸ø¶¨Î»ÖÃÖ®ºóµÄλÖÃ
 public Position insertAfter(Position p, Object e)
 throws ExceptionPositionInvalid;
//½«e²åÈëÖÁ½ô¿¿¸ø¶¨Î»ÖÃ֮ǰµÄλÖÃ
 public Position insertBefore(Position p, Object e)
 throws ExceptionPositionInvalid;
//ɾ³ý¸ø¶¨Î»Öô¦µÄÔªËØ£¬²¢·µ»ØÖ®
 public Object remove(Position p)
 throws ExceptionPositionInvalid;
//ɾ³ýÊ×ÔªËØ£¬²¢·µ»ØÖ®
 public Object removeFirst();
//ɾ³ýÄ©ÔªËØ£¬²¢·µ»ØÖ®
 public Object removeLast();
//½«´¦ÓÚ¸ø¶¨Î»ÖõÄÔªËØÌ滻ΪÐÂÔªËØ£¬²¢·µ»Ø±»Ìæ»»µÄÔªËØ
 public Object replace(Position p, Object e)
 throws ExceptionPositionInvalid;
//λÖõü´úÆ÷
 public Iterator positions();
//ÔªËصü´úÆ÷
 public Iterator elements();
}
/*
 * »ùÓÚË«ÏòÁ´±íʵÏÖÁбí½á¹¹
 */
package dsa;
public class List_DLNode implements List {
 protected int numElem;//ÁбíµÄʵ¼Ê¹æÄ£
 protected DLNode header, trailer;//ÉÚ±ø£ºÊ×½Úµã+Ä©½Úµã
//¹¹Ô캯Êý
 public List_DLNode() {
  numElem = 0;//¿Õ±í
  header = new DLNode(null, null, null);//Í·½Úµã
  trailer = new DLNode(null, header, null);//β½Úµã
  header.setNext(trai


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