ArrayList iterator() method in Java with Examples

Last Updated : 11 Dec, 2018
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The iterator() method of ArrayList class in Java Collection Framework is used to get an iterator over the elements in this list in proper sequence. The returned iterator is fail-fast. Syntax: 
 Iterator iterator()
Parameter: This method do not accept any parameter. Return Value: This method returns an iterator over the elements in this list in proper sequence Below examples illustrate the ArrayList.iterator() method: Program 1: JAVA 
// Java code to illustrate iterator()

import java.util.*;

public class GFG {

    public static void main(String[] args)
    {
        // Create and populate the list
        ArrayList<String> list
            = new ArrayList<>();

        list.add("Geeks");
        list.add("for");
        list.add("Geeks");
        list.add("is");
        list.add("a");
        list.add("CS");
        list.add("Students");
        list.add("Portal");

        // Displaying the list
        System.out.println("The list is: \n"
                           + list);

        // Create an iterator for the list
        // using iterator() method
        Iterator<String> iter
            = list.iterator();

        // Displaying the values after iterating
        // through the list
        System.out.println("\nThe iterator values"
                           + " of list are: ");
        while (iter.hasNext()) {
            System.out.print(iter.next() + " ");
        }
    }
}
Output: 
The list is: 
[Geeks, for, Geeks, is, a, CS, Students, Portal]

The iterator values of list are: 
Geeks for Geeks is a CS Students Portal
Program 2: Java 
// Java code to illustrate iterator()

import java.util.*;

public class GFG {

    public static void main(String args[])
    {
        // Creating an empty ArrayList
        ArrayList<Integer> list
            = new ArrayList<Integer>();

        // Use add() method to add
        // elements into the list
        list.add(10);
        list.add(15);
        list.add(30);
        list.add(20);
        list.add(5);

        // Displaying the list
        System.out.println("The list is: \n"
                           + list);

        // Create an iterator for the list
        // using iterator() method
        Iterator<Integer> iter = list.iterator();

        // Displaying the values
        // after iterating through the list
        System.out.println("\nThe iterator values"
                           + " of list are: ");
        while (iter.hasNext()) {
            System.out.print(iter.next() + " ");
        }
    }
}
Output: 
The list is: 
[10, 15, 30, 20, 5]

The iterator values of list are: 
10 15 30 20 5

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