What is the difference between Iterator and ListIterator ?

What is the difference between Iterator and ListIterator ?

  

 Iterator:-

     An iterator over a collection.

     By using Iterator we can retrieve the elements from Collection Object in forward direction only.

     We can use Iterator to traverse Set and List and also Map type of Objects.

           Iterator    iterator = Set.iterator();

           Iterator    iterator = List.iterator();

    Methods in Iterator :

•   hashNext()
•   next()
•  remove()

ListIterator:-

        An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. 

          A ListIterator has no current element; its cursor position always lies between the element that would be returned by a call to previous() and the element that would be returned by a call to next().

          But List Iterator can be used to traverse for List type Objects, but not for Set type of Objects.

                            ListIterator      listIterator = List.listIterator();

          i.e., we can't get List Iterator object from Set interface.

       Which allows you to traverse in either directions. That is List Iterators traverse two directions. So it has another methods hasPrevious() & previous() other than Iterator.

      

      Methods in ListIterator 

•  hashNext()
•  next()
• previous()
• hashPrevious()
• remove()
• nextIndex()
• previousIndex()