public  void add(char element)
Inserts the specified element into my underlying collection
(optional operation).
The element is inserted immediately before the next element
that would have been returned by #next , if any,
and immediately after the next element that would have been
returned by #previous , if any.

The new element is inserted immediately before the implied
cursor. A subsequent call to #previous  will return
the added element, a subsequent call to #next  will
be unaffected. This call increases by one the value that
would be returned by a call to #nextIndex  or
#previousIndex .

 public boolean hasNext()
Returns true iff I have more elements
when traversed in the forward direction.
(In other words, returns true iff
a call to #next  will return an element
rather than throwing an exception.

 public boolean hasPrevious()
Returns true iff I have more elements
when traversed in the reverse direction.
(In other words, returns true iff
a call to #previous  will return an element
rather than throwing an exception.

 public char next()
Returns the next element in me when traversed in the
forward direction.

 public int nextIndex()
Returns the index of the element that would be returned
by a subsequent call to #next , or the number
of elements in my iteration if I have no next element.

 public char previous()
Returns the next element in me when traversed in the
reverse direction.

 public int previousIndex()
Returns the index of the element that would be returned
by a subsequent call to #previous , or
-1 if I have no previous element.

 public  void remove()
Removes from my underlying collection the last
element returned by #next  or #previous 
(optional operation).

 public  void set(char element)
Replaces in my underlying collection the last
element returned by #next  or #previous 
with the specified value (optional operation).