Java Reference
In-Depth Information
Display 15.18
Using an Iterator
(part 2 of 2)
41
System.out.println("List now contains:");
42
i.restart( );
43
while
(i.hasNext( ))
44
System.out.println(i.next( ));
45
System.out.println( );
46
}
47
}
Sample Dialogue
List contains:
coat
orange juice
shoes
Will delete the node for orange juice
List now contains:
coat
shoes
Will add one node before shoes
List now contains:
coat
socks
shoes
Changing all items to credit card.
List now contains:
credit card
credit card
credit card
The basic method for cycling through the elements in the linked list using an itera-
tor is illustrated by the following code from the demonstration program:
System.out.println("List now contains:");
i.restart( );
while
(i.hasNext( ))
System.out.println(i.next( ));
The iterator is named
i
in this code. The iterator
i
is reset to the beginning of the list with
the method invocation
i.restart( )
, and each execution of
i.next( )
produces the
next data item in the linked list. After all the data items in all the nodes have been returned
by
i.next( )
, the Boolean
i.hasNext( )
becomes
false
and the
while
loop ends.
