Java Reference
In-Depth Information
the element that would be returned by a call to previous() and the element that
wouldbereturnedbyacallto next() .Alistiteratorforalistoflength n has n +1pos-
sible cursor positions, as illustrated by each caret ( ^ ) as shown here:
... Element(n-1)
tions: ^
The remove() and set() methodsarenotdefinedintermsofthecursorposition;
theyaredefinedtooperateonthelastelementreturnedbyacallto next() or pre-
vious() .
Note Youcanmixcallsto next() and previous() aslongasyouarecareful.
Keep inmind that the first call to previous() returns the same element asthe last
callto next() .Furthermore,thefirstcallto next() followingasequenceofcallsto
previous() returns the same element as the last call to previous() .
Table 5-2 's description of the subList() method refers to the concept of a view ,
flectedinthisbackinglist.Theviewcancovertheentirelistor,as subList() 'sname
implies, only part of the list.
The subList() method is useful for performing range-view operations over a
list in a compact manner. For example, list.subList(fromIndex, toIn-
dex).clear(); removesarangeofelementsfrom list wherethefirstelementis
located at fromIndex and the last element is located at toIndex-1 .
Caution Aview'smeaningbecomesundefinedwhenchangesaremadetotheback-
inglist.Therefore,youshouldonlyuse subList() temporarily,wheneveryouneed
to perform a sequence of range operations on the backing list.
The ArrayList classprovidesalistimplementationthatisbasedonaninternalarray
insertions and deletions of elements is slow.
ArrayList supplies three constructors:
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