Iterate through a LinkedList using an Iterator in Java

package com.javaguides.collections.linkedlistexamples; import java.util.Iterator; import java.util.LinkedList; public class IterateOverLinkedListExample { public static void main(String[] args) { LinkedList < String > progLangs = new LinkedList < > (); progLangs.add("C"); progLangs.add("C++"); progLangs.add("Core Java"); progLangs.add("Java EE"); progLangs.add("Spring Framework"); progLangs.add("Hibernate Framework"); System.out.println("\n=== Iterate over a LinkedList using iterator() ==="); Iterator < String > iterator = progLangs.iterator(); while (iterator.hasNext()) { String speciesName = iterator.next(); System.out.println(speciesName); } System.out.println("\n=== Iterate over a LinkedList using iterator() and Java 8 forEachRemaining() method ==="); iterator = progLangs.iterator(); iterator.forEachRemaining(speciesName - > { System.out.println(speciesName); }); System.out.println("\n=== Iterate over a LinkedList using descendingIterator() ==="); Iterator < String > descendingIterator = progLangs.descendingIterator(); while (descendingIterator.hasNext()) { String speciesName = descendingIterator.next(); System.out.println(speciesName); } System.out.println("\n=== Iterate over a LinkedList using listIterator() ==="); // ListIterator can be used to iterate over the LinkedList in both forward and backward directions // In this example, we start from the end of the list and traverse backwards ListIterator < String > listIterator = progLangs.listIterator(progLangs.size()); while (listIterator.hasPrevious()) { String speciesName = listIterator.previous(); System.out.println(speciesName); } } }

Output

=== Iterate over a LinkedList using iterator() === C C++ Core Java Java EE Spring Framework Hibernate Framework === Iterate over a LinkedList using iterator() and Java 8 forEachRemaining() method === C C++ Core Java Java EE Spring Framework Hibernate Framework === Iterate over a LinkedList using descendingIterator() === Hibernate Framework Spring Framework Java EE Core Java C++ C === Iterate over a LinkedList using listIterator() === Hibernate Framework Spring Framework Java EE Core Java C++ C