Obtain an iterator to the start of the collection by calling the collection's iterator() method. See the example below. Top YouTube Channel (75K+ Subscribers): Check out my YouTube channel for free videos and courses - Java Guides YouTube Channel, My Udemy Courses - https://www.udemy.com/user/ramesh-fadatare/, Connect with me on The implementation classes of List interface are ArrayList, LinkedList, Stack, and Vector. It represents an operation that accepts a single input argument and returns no result. Extending the Delta-Wye/-Y Transformation to higher polygons, Is there a deep meaning to the fact that the particle, in a literary context, can be used in place of . (, 20+ basic algorithms interview questions for programmers (, Top 5 Courses to become full-stack Java developer (, The difference between Hashtable and HashMap in Java? *; public class Main. In this tutorial, we are going to see different ways to iterate through a list in Java. You can check out. English equivalent for the Arabic saying: "A hungry man can't enjoy the beauty of the sunset". List<String> colors = new ArrayList<String> (); Better if you show with example. Have the loop iterate as long as hasNext() returns true. andStackOverflow, Copyright 2018 - 2025 how to iterate in List<List<Integer>> in java and set their values as we do in a normal int a [i] [j] matrix type [duplicate] Ask Question Asked 3 years, 10 months ago Modified 3 years, 10 months ago Viewed 30k times 3 This question already has answers here : How do I loop thorough a 2D ArrayList in Java and fill it? Customizing a Basic List of Figures Display. How to Replace an Element at a Specific Index of the Vector in Java? It is widely used to perform traversal over the List. (3 answers) Closed 3 years ago. 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The consent submitted will only be used for data processing originating from this website. rev2023.7.7.43526. How to iterate through Collection Objects? For the second code above (using arrays), we can print all the values of the two-dimensional array using: And in case of arraylist, similar thing can be done as: Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 8 List<WebElement> allLinks = driver.findElements (By.xpath ("//div [@class='datepicker']/div/table/tbody/tr/td/table/tbody [2]/tr/td [@class='' or @class='datepickerSaturday' or @class='datepickerSunday']/a/span")); Iterator<WebElement> itr = allLinks.iterator (); while (itr.hasNext ()) { System.out.println (itr.next ()); } (, Top 10 courses to learn Python for Beginners (, The difference between HashSet and TreeSet in Java? Overview In this quick tutorial, we'll learn about various ways in which we can iterate backward through a list in Java. Hi, I am Ramesh Fadatare. This tutorial introduces how to iterate through the list in Java and lists some example codes to understand the topic. The Iterable interface provides forEach() method to iterate over the List. Developed by JavaTpoint. How to iterate a Java List using Iterator? It extends Iterator interface. See the example below. Item b is located at index 1 How to Iterate Through HashTable in Java? Feel free to comment, ask questions if you have any doubt. Iterating or looping a List is a common task in a day to day project work so in this article, I would like to demonstrate different ways to iterate over a List using JDK 7 and 8. You can even use a while loop to accessthe list elements. 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It throws NullPointerException if the specified action is null. Practice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews. Facebook, All this technique can be applied to any index-based, how to loop through a list using the forEach()method, Java Tutorial for Complete Beginners (FREE), best data structure and algorithms courses. Iterate ArrayList with Simple For Loop. You can do this operation similar as we do with the two-dimensional arrays using two for-loops: And fetching data from that list is more simple. Example Java import java.io. Using enhanced For loop Using Iterator method Using Simple For loop Using forEach method Method 1: Using enhanced For loop Syntax used : for (datatype variable : collection_used) Example: Java import java.io. So, there were standard three traversals available so do three methods do exists but with the introduction of java 8 and streams other methods do arises out. 11 Answers Sorted by: 20 Just increase i by 2 on each iteration, instead of ++ (which increments by 1): for (int i = 0; i + 1 < strings.size (); i += 2) { String first = strings.get (i); String second = strings.get (i + 1); } Share Improve this answer Follow edited Apr 20 at 16:44 Danon 2,708 27 37 answered Apr 16, 2013 at 9:47 hyde Before you can access a collection through an iterator, you must obtain one. Thank you for your valuable feedback! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I have a master's degree in computer science and over 18 years of experience designing and developing Java applications. How to Iterate List in Java In Java, List is is an interface of the Collection framework. Maintain the list index in a separate variable and increment it each time you access the list as given below. The ArrayList and LinkedList are widely used in Java. Java Program to Check Whether an Element Occurs in a List. Gson: Convert String to JsonObject without POJO, Iterate List in Reverse order in Java Example, Convert LinkedHashMap to List Java Example, Iterate LinkedHashMap in Reverse Order Java Example, Java ArrayList insert element at beginning example, Count occurrences of substring in string in Java example, Check if String is uppercase in Java example. 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