All TalkersCode Topics

Follow TalkersCode On Social Media - A Social Media Network for developers Join Now ➔

Adding Elements To Arraylist In Java Using For Loop

Last Updated : Mar 11, 2024

Adding Elements To Arraylist In Java Using For Loop

In this article we will show you the solution of adding elements to arraylist in java using for loop, a difference between arrays and this array is the size limit of the array. An array of this size can have any size, as can any array.

As compared with traditional arrays, this array offers much greater flexibility.

This package can be found in java.util package. Similarly, vectors in C++ work in the same way.

Java ArrayLists allow duplicate elements as well. As a result of inheriting the AbstractList class, the List interface is implemented.

Java ArrayList classes might contain duplicate elements.

As long as the ArrayList are inserted in the right order, the order will be preserved.

Java ArrayLists cannot be synchronized. Java ArrayLists allow random access to arrays because of their index-based structure.

In Java, manipulation of ArrayLists is a little slower than that of LinkedList due to the amount of shifting required to remove an element from an array list.

In the case of an array list, it is not possible to use a primitive type. There are many types of data in this category, including ints, floats, and chars.

The appropriate wrapper class must be used whenever this is the case.

A Java ArrayList's size determines how it will be initialized. By adding and removing elements from dynamic array lists, their size can vary.

Types in generic collections are specified using angular braces. In an ArrayList, only specified types of objects are allowed.

In the case of adding an object of a different type, compilation errors occur.

It implements the List interface by implementing an Array data structure.

There are no list operations that cannot be applied to a null element, so you can apply any of the list operations to any element in a list.

ArrayList is a great alternative to Java arrays that is preferred by most Java developers.

The Java array and ArrayList are compared

The key difference between arraylists and arrays is that arraylists can grow and shrink dynamically.

Due to arrays' fixed length, it is impossible to add more elements to a full array.

Due to the fact that there is no change in the number of elements in an array list when elements are removed, the memory consumption remains constant.

It is important to note that elements in an ArrayList are sorted by their zero-based index.

Because of this, ArrayList always contains zero elements and ends with one element, n being the size of the array list.

Internally, Java ArrayLists contain dynamic arrays that store their data. By removing elements from an array, the size is automatically reduced, but not the capacity.

On the other hand, an array list can add or remove elements automatically based on dynamic growth and shrinking.

import java.util.*;
class JavaExample{
   public static void main(String args[]){
      ArrayList<String> arrList=new ArrayList<String>();
   arrList.add(3, "Alexa");
  1. As a first step, we create an import function in our program.
  2. A program execution class is then created.
  3. Our next step is to define the public static void main function.
  4. As part of the java.util package, the ArrayList class provides resizable arrays.
  5. In the next step, we add a list of arrays.
  6. Afterwards, we exit the program by calling system.out.printIn.

Conclusion :-

Java ArrayLists store their data internally in a dynamic array. There is no automatic way for ArrayLists to reduce their capacity.

If elements are removed from an array, their size is automatically reduced, but not their capacity.

The elements of an array list can, however, be automatically added and removed when it grows and shrinks dynamically.

I hope this article on adding elements to arraylist in java using for loop helps you and the steps and method mentioned above are easy to follow and implement.