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Util.Collections
Class BackwardIterator  

java.lang.Object
  Util.Collections.BackwardIterator

All Implemented Interfaces:

java.util.Iterator, java.util.ListIterator

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public class BackwardIterator

extends java.lang.Object

implements java.util.ListIterator

Version:

$Id: BackwardIterator.java,v 1.2 2003/05/12 10:05:21 joewhaley Exp $

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Field Summary
private  java.util.ListIterator	i

 

Constructor Summary

BackwardIterator(java.util.List x)

BackwardIterator(java.util.ListIterator x)

 

Method Summary
void	add(java.lang.Object obj)           Insert an element into the list at the current position of the iterator (optional operation).
boolean	hasNext()           Tests whether there are elements remaining in the list in the forward direction.
boolean	hasPrevious()           Tests whether there are elements remaining in the list in the reverse direction.
java.lang.Object	next()           Obtain the next element in the list in the forward direction.
int	nextIndex()           Find the index of the element that would be returned by a call to next.
java.lang.Object	previous()           Obtain the next element in the list in the reverse direction.
int	previousIndex()           Find the index of the element that would be returned by a call to previous.
void	remove()           Remove from the list the element last returned by a call to next or previous (optional operation).
void	set(java.lang.Object obj)           Replace the element last returned by a call to next or previous with a given object (optional operation).

 

Methods inherited from class java.lang.Object

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

 

Field Detail

i

private final java.util.ListIterator i

Constructor Detail

BackwardIterator

public BackwardIterator(java.util.ListIterator x)

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BackwardIterator

public BackwardIterator(java.util.List x)

Method Detail

previousIndex

public int previousIndex()

Description copied from interface: java.util.ListIterator

Find the index of the element that would be returned by a call to previous. If hasPrevious() returns false, this returns -1.

Specified by:

previousIndex in interface java.util.ListIterator

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hasNext

public boolean hasNext()

Description copied from interface: java.util.ListIterator

Tests whether there are elements remaining in the list in the forward direction. In other words, next() will not fail with a NoSuchElementException.

Specified by:

hasNext in interface java.util.ListIterator

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set

public void set(java.lang.Object obj)

Description copied from interface: java.util.ListIterator

Replace the element last returned by a call to next or previous with a given object (optional operation). This method may only be called if neither add nor remove have been called since the last call to next or previous.

Specified by:

set in interface java.util.ListIterator

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next

public java.lang.Object next()

Description copied from interface: java.util.ListIterator

Obtain the next element in the list in the forward direction. Repeated calls to next may be used to iterate over the entire list, or calls to next and previous may be used together to go forwards and backwards. Alternating calls to next and previous will return the same element.

Specified by:

next in interface java.util.ListIterator

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nextIndex

public int nextIndex()

Description copied from interface: java.util.ListIterator

Find the index of the element that would be returned by a call to next. If hasNext() returns false, this returns the list size.

Specified by:

nextIndex in interface java.util.ListIterator

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remove

public void remove()

Description copied from interface: java.util.ListIterator

Remove from the list the element last returned by a call to next or previous (optional operation). This method may only be called if neither add nor remove have been called since the last call to next or previous.

Specified by:

remove in interface java.util.ListIterator

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hasPrevious

public boolean hasPrevious()

Description copied from interface: java.util.ListIterator

Tests whether there are elements remaining in the list in the reverse direction. In other words, previous() will not fail with a NoSuchElementException.

Specified by:

hasPrevious in interface java.util.ListIterator

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add

public void add(java.lang.Object obj)

Description copied from interface: java.util.ListIterator

Insert an element into the list at the current position of the iterator (optional operation). The element is inserted in between the element that would be returned by previous and the element that would be returned by next. After the insertion, a subsequent call to next is unaffected, but a call to previous returns the item that was added. The values returned by nextIndex() and previousIndex() are incremented.

Specified by:

add in interface java.util.ListIterator

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previous

public java.lang.Object previous()

Description copied from interface: java.util.ListIterator

Obtain the next element in the list in the reverse direction. Repeated calls to previous may be used to iterate backwards over the entire list, or calls to next and previous may be used together to go forwards and backwards. Alternating calls to next and previous will return the same element.

Specified by:

previous in interface java.util.ListIterator

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