How to use iterator method in java

/*

iterator() method is defined as  - Iterator iterator in Collection interface

*/

import java.util.*;

public class iteratorMethod {

    public static void main(String[] args) {

        ArrayList a1 = new ArrayList();

        a1.add("a");

        a1.add("b");

        a1.add("c");

        a1.add("d");

       

        Iterator itr = a1.iterator();

        while(itr.hasNext())

        {

            Object instance = itr.next();

            System.out.println("The Output is " + instance);

        }

       

    }

}

Answer

----------

The Output is a

The Output is b

The Output is c

The Output is d