remove duplicate elements in arraylist

//remove duplicate elements in arraylist
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;

public class RemDupFromList {
public static void main(String[] args)
{
List li = new ArrayList();
li.add("one");
li.add("two");
li.add("three");
li.add("one");//Duplicate
li.add("one");//Duplicate
// We have facility to pass a List into Set constructor and vice verse to cast
List li2 = new ArrayList(new HashSet(li)); //no order
// List li2 = new ArrayList(new LinkedHashSet(li)); //If you need to preserve the order use 'LinkedHashSet'
Iterator it= li2.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
}