arraylist iterator

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;

public class MainClass {
public static void main(String args[]) {
ArrayList al = new ArrayList();

al.add("C");
al.add("A");
al.add("E");
al.add("B");
al.add("D");
al.add("F");

System.out.print("Original contents of al: ");
Iterator itr = al.iterator();
while (itr.hasNext()) {
String element = itr.next();
System.out.print(element + " ");
}
System.out.println();

ListIterator litr = al.listIterator();
while (litr.hasNext()) {
String element = litr.next();
litr.set(element + "+");
}

// Now, display the list backwards.
System.out.print("Modified list backwards: ");
while (litr.hasPrevious()) {
String element = litr.previous();
System.out.print(element + " ");
}
}

}

/*things I've learned in this exercise:

Iterator takes the place of Enumeration in the Java collections framework.

• Iterators allow the user to remove elements from the underlying collection during the iteration.
• Method names have been improved in this Interface.

*/