problem in remove() in iterator.

[Ritesh raushan]

problem in remove() when i remove this method then output is infinite loop,
but when i write this method the output is 13,14,15,13,13.i don't know how came

import java.util.*;
import java.io.*;
class ArrayListDemo
{
public static void main(String[] args)throws IOException{
Vector v=new Vector();
v.add(13);
v.add(14);
v.add(15);
v.add(13);
v.add(13);
for(ListIterator it=v.listIterator();it.hasNext();){
Integer o=(Integer)it.next();
Integer in=(Integer)it.previous();
it.remove();
/* when i remove  this method [remove()] the program o/p is
 infinite but when this method is written program o/p is 13,14,15,13,13 */
System.out.println(in);}
}}

[Jeff Verdegan]

If you read the docs, you'll see that calling next() and previous() doesn't just return the next or previous element. It also changes the state of the iterator, moving it one forward or one back. If you don't call remove(), then you're just going forward, back, forward, back, ... forever, and never getting to the end of the list.

[Paul Witten]

Jeff Verdegan wrote:If you don't call remove(), then you're just going forward, back, forward, back, ... forever, and never getting to the end of the list.

Did not know that.

Reminds me of Vote=Left, Vote=Right, Vote=Left, Vote=Right ...