listiterator?

[bairava surya]

public class First 
{
     public static void main(String[] args)
	{
		ArrayList<Integer> a=new ArrayList<Integer>();
		a.add(2);a.add(20);a.add(23);a.add(28);
                ListIterator w=a.listIterator();
           while(w.hasPrevious())
                {
    	         System.out.println(w.previous());
                }
	}
}

code doesnt work helpme?

[Stefan Evans]

What is not working about it?
It compiles, it runs.
What output are you expecting?

Calling the listIterator() method gives you an iterator pointing at the head/start of a list.
What comes before the start of a list?

[bairava surya]

am not getting the backward traversal as output?

[Stefan Evans]

Well if you want a backward iteration, you will have to START at the other end of the list.
There is an overloaded version of listIterator() method that should help you do that. See java.util.List interface

[bairava surya]

how i can modify the above program to print in reverse order?

[Sekhar Nat]

ArrayList<Integer> a=new ArrayList<Integer>();
        a.add(2);a.add(20);a.add(23);a.add(28);
                ListIterator w=a.listIterator(a.size());
           while(w.hasPrevious())
                {
                 System.out.println(w.previous());
                }

Quoting the docs:

ListIterator<E> listIterator()
Returns a list iterator over the elements in this list (in proper sequence).
ListIterator<E> listIterator(int index)
Returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list.

[bairava surya]

what is fill ratio in java i had come cross in concept of hashmap?

[Stephan van Hulst]

Bairava, please take the time to read the tutorials and the JavaDocs. A lot of these questions can then be answered with a quick Google search.