Thread: collection problem

Hi all,

I am new to this forum.

I am using this code but it is not giving any out put

import java.util.*;
public class ListiteratorDemo {

public static void main(String args[])
{
ArrayList ob = new ArrayList();
ob.add(4);
ob.add(5);
ob.add(6);
ob.add(7);
ListIterator lit = ob.listIterator();
while(lit.hasPrevious())
{
System.out.println(lit.previous());
}
}
}





please help me!!!!!!!

previous is there man . why it is not showing my elements ?

Hello freakycoder!

Originally Posted by freakycoder

previous is there man . why it is not showing my elements ?

From the API:hasPrevious() Returns true if this list iterator has more elements when traversing the list in the reverse direction. (In other words, returns true if previous would return an element rather than throwing an exception.)

Therefore if you print lit.previous() before the loop you will see if there is a previous element in your list.

Not getting

Originally Posted by freakycoder

Not getting

Did you put

System.out.println(lit.previous());

before the while loop in your code?
You don't get what is printed from the above statement?

No , but i but it there it will show NoSuchElementException and putting it as show above it show no out put just blank console

System.out.println(lit.hasPrevious()); it is printing false . what its mean

yeah it is working but is it compulsory to write next() method before each of previous method?

Now its working but I want to know one more thing that is it compulsory to write next method before each of previous() method ?