ArrayList iterator() method in Java with Examples
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 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 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
