Java Reference
In-Depth Information
}
Next, let us turn to the iterator class. The
ListIterator
interface in the standard
library defines nine methods. We omit four of them (the methods that move the
iterator backwards and the methods that report an integer index of the iterator).
Figure 5
Removing the First Node from a Linked List
673
674
Our
LinkedList
class defines a private inner class
LinkedListIterator
,
which implements the simplified
ListIterator
interface. Because
LinkedListIterator
is an inner class, it has access to the private features of the
LinkedList
classȌin particular, the
first
field and the private
Node
class.
Note that clients of the
LinkedList
class don't actually know the name of the
iterator class. They only know it is a class that implements the
ListIterator
interface.
public class LinkedList
{
. . .
public ListIterator listIterator()
{
return new LinkedListIterator();
}
private class LinkedListIterator
implements ListIterator
{
public LinkedListIterator()
{
position = null;
previous = null;
}
. . .
