import java.util.*;
class TestListIterator
{
public static void main(String[] args)
{
ArrayList<Integer> al=new ArrayList<Integer>();
al.add(10);
al.add(20);
al.add(30);
al.add(40);
ListIterator it=al.listIterator();
while(it.hasNext())
{
System.out.println(it.next());
}
while(it.hasPrevious())
{
System.out.println(it.previous());
}
}
}
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