structure5
Class DoublyLinkedListIterator<E>

java.lang.Object
  structure5.AbstractIterator<E>
      structure5.DoublyLinkedListIterator<E>

All Implemented Interfaces:

Iterable<E>, Enumeration<E>, Iterator<E>

public class DoublyLinkedListIterator<E>
extends AbstractIterator<E>

An iterator for traversing the elements of a doubly linked list. The iterator traverses the list beginning at the head, and heads toward tail. Typical use:

      List l = new DoublyLinkedList();
      // ...list gets built up...
      Iterator li = l.iterator();
      while (li.hasNext())
      {
          System.out.println(li.get());
          li.next();
      }
      li.reset();
      while (li.hasNext())
      { .... }
 

Constructor Summary

DoublyLinkedListIterator(DoublyLinkedListElement<E> h)
Construct an iterator over a doubly linked list hanging from head.

DoublyLinkedListIterator(DoublyLinkedListElement<E> headDummy, DoublyLinkedListElement<E> tailDummy)

Method Summary

E	get() Get reference to value that is current.
boolean	hasNext() Determine if there are more elements to be considered.
E	next() Returns reference to the current element, then increments iterator.
void	reset() Reset the iterator to the head of the list.

Methods inherited from class structure5.AbstractIterator

hasMoreElements, iterator, nextElement, remove, value

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DoublyLinkedListIterator

public DoublyLinkedListIterator(DoublyLinkedListElement<E> h)

Construct an iterator over a doubly linked list hanging from head.

Parameters:

h - The head of the list to be traversed.

DoublyLinkedListIterator

public DoublyLinkedListIterator(DoublyLinkedListElement<E> headDummy,
                                DoublyLinkedListElement<E> tailDummy)

Method Detail

reset

public void reset()

Reset the iterator to the head of the list.

Specified by:

reset in class AbstractIterator<E>

hasNext

public boolean hasNext()

Determine if there are more elements to be considered.

Specified by:

hasNext in interface Iterator<E>

Specified by:

hasNext in class AbstractIterator<E>

Returns:

True iff there are more elements to be considered.

See Also:

AbstractIterator.hasMoreElements()

next

public E next()

Returns reference to the current element, then increments iterator.

Specified by:

next in interface Iterator<E>

Specified by:

next in class AbstractIterator<E>

Returns:

Reference to element that was current before increment.

See Also:

AbstractIterator.hasMoreElements(), AbstractIterator.value()

get

public E get()

Get reference to value that is current.

Specified by:

get in class AbstractIterator<E>

Returns:

A reference to the value that is current.