Java Tutorials with Internals

An ArrayList is a group of common elements. It is concrete implementation of List interface. ArrayList has ordered elements in which order they added.We can declare and assign elements to it in one line in various ways. Output: Sample ArrayList:: [one, two, three, four] Stream Arraylist:: [abc, xyz] Look at my other posts: Stack in Java Custom Stack Implementation Set Interface in Java Custom Doubly LinkedList Implementation Custom LinkedList Implementation How to fetch elements from LinkedList List Traversal How to insert elements in List How to remove element from list How to declare Linked List and Implement LinkedList Traversal In Reverse Sequential Order ArrayList in Java How to declare array list in java Some other interesting blogs: IOT and Big Data Technologies Sustainability Cloud

There are so many questions comes into mind when we go to the coding floor and starts writing the code for list like how to traverse the list in java? What are the different ways to traverse a list? Which is the best way? Which way needs to be followed? Here, we will try to find out the answers of these questions. There are two ways to traverse the list - forward or backward. The list has given methods like next and previous. We can iterate the list starting from a specific index too. Output : Iterating list in forward direction... one two three four five Iterating list in backward direction... five four three two one Iterating list from specified position... three four five Look at my other posts: Stack in Java Custom Stack Implementation Set Interface in Java Custom Doubly LinkedList Implementation Custom LinkedList Implementation How to fetch elements from LinkedList List Traversal How to insert elements in List How to remove element...

 List interface keeps the order of insertion of elements i.e. the order in which the elements added to the list will remain in same order after any operation. Every addition takes the index of last inserted element plus one (last index + 1). 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 package net . raj . test ; import java.util.ArrayList ; import java.util.List ; public class ArrayListImpl { public static void main ( String [] args ) { // Declare an ArrayList List & lt ; String & gt ; list = new ArrayList & lt ;& gt ;(); list . add ( "one" ); list . add ( "two" ); list . add ( "three" ); list . add ( "four" ); System . out . println ( "Sample ArrayList 1:: " + list . toString ()); // Reuse the same object // list keeps the order list = new ArrayL...