Java LinkedList iterator() Method with Examples

Java LinkedList iterator() Method with Examples

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In the previous article, we have discussed about Java LinkedList lastIndexOf() Method with Examples

In this article we are going to see the use of Java LinkedList iterator() method along with suitable examples.

Java LinkedList iterator() Method with Examples

This java.util.LinkedList.iterator() method is used to get an iterator to retrieve each element of the LinkedList in a proper order.

Syntax:

LinkedListName.iterator()

Where,

  • LinkedListName refers to the name of your LinkedList.

Let’s see different examples to understand it more clearly.

Example-1: Java LinkedList iterator() Method – Example with String Type LinkedList

Approach:

  • Create a new LinkedList of type String.
  • Add string elements into the LinkedList using the add() method.
  • Display the LinkedList elements.
  • Create a variable of Iterator and store the iterator returned by iterator() method.
  • Use a while loop through LinkedList till it has all elements.
  • Inside iterator() method there is some inbuild methods like hasNext() to check next element exists or not and  next() to access the next element.
  • Print the LinkedList.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // Create an LinkedList of string datatype
        LinkedList<String> l1 = new LinkedList<String>();
        // Adding some elements to the LinkedList
        l1.add("vivo");
        l1.add("htc");
        l1.add("samsung");
        l1.add("realme");
        l1.add("nokia");
        // Prints the LinkedList elements
        System.out.println("The elements in the LinkedList are: "+l1);
        // Create an object of Iterator 
        Iterator<String> iterate = l1.iterator();
        System.out.print("LinkedList: ");
        // loop through LinkedList till it has all elements
        while(iterate.hasNext())
        {
            // Use methods of Iterator to access elements
            System.out.print(iterate.next());
            System.out.print("  ");
        }
    }
}

Output:

The elements in the LinkedList are: [vivo, htc, samsung, realme, nokia]
LinkedList: vivo htc samsung realme nokia

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