Java Reference
In-Depth Information
•
boolean hasPrevious()
returnstruewhenthislistiteratorhasmoreele-
ments when traversing the list in the reverse direction.
•
E next()
returns the next element in this list and advances the cursor po-
sition. This method throws
NoSuchElementException
when there is no
next element.
•
int nextIndex()
returnstheindexoftheelementthatwouldbereturned
by a subsequent call to
next()
, or the size of the list when at the end of the
list.
•
E previous()
returns the previous element in this list and moves the
cursor position backwards. This method throws
NoSuchElementExcep-
tion
when there is no previous element.
•
int previousIndex()
returnstheindexoftheelementthatwouldbere-
turned by a subsequent call to
previous()
, or -1 when at the beginning of
the list.
•
void remove()
removes from the list the last element that was returned
by
next()
or
previous()
. This call can be made only once per call to
next()
or
previous()
. Furthermore, it can be made only when
add()
has not been called after the last call to
next()
or
previous()
. This
method throws
UnsupportedOperationException
when this list iter-
ator does not support
remove()
, and
IllegalStateException
when
neither
next()
nor
previous()
hasbeencalled,or
remove()
or
add()
has already been called after the last call to
next()
or
previous()
.
•
void set(E e)
replacesthelastelementreturnedby
next()
or
previ-
ous()
with element
e
. This call can be made only when neither
remove()
nor
add()
has been called after the last call to
next()
or
previous()
.
This method throws
UnsupportedOperationException
when this list
iterator does not support
set()
,
ClassCastException
when
e
'sclass is
inappropriateforthislist,
IllegalArgumentException
whensomeprop-
erty of
e
prevents it from being added to this list, and
IllegalStateEx-
ception
when neither
next()
nor
previous()
has been called, or
re-
move()
or
add()
has already been called after the last call to
next()
or
previous()
.
A
ListIterator
instancedoesnothavetheconceptofacurrentelement.Instead,
it has the concept of a
cursor
for navigating through a list. The
nextIndex()
and
previousIndex()
methods return the
cursor position
, which always lies between
