Elements in an ArrayList are actually objects. In the examples above, we created elements (objects) of type "String". Remember that a String in Java is an object (not a primitive type). To use other types, such as int, you must specify an equivalent wrapper class: Integer.

Oct 22, 2021 · We can use the Object class to declare our ArrayList using the syntax mentioned below. ArrayList<Object> list = new ArrayList<Object>(); The above list can hold values of any type. The code given below presents an example of …

How to Creating an Arraylist of Objects. Create an array to store the objects: In a single step: list.add(new MyObject (1, 2, 3)); //Create a new object and adding it to list. or. MyObject myObject = new MyObject (1, 2, 3); //Create a new object. list.add(myObject); // Adding it to the list.

Mar 12, 2025 · Constructors in ArrayList in Java. In order to Create an ArrayList, we need to create an object of the ArrayList class. The ArrayList class consists of various constructors which allow the possible creation of the array list. The following are the constructors available in …

Oct 27, 2013 · You need to use the new operator when creating the object. Contacts.add(new Data(name, address, contact)); // Creating a new object and adding it to list - single step or else. Data objt = new Data(name, address, contact); // Creating a new object Contacts.add(objt); // Adding it to the list and your constructor shouldn't contain void. Else it ...

Mar 7, 2025 · In this tutorial, we’ll learn how to create an ArrayList that can hold multiple object types in Java. We’ll also learn how to add data of multiple types into an ArrayList and then retrieve data from the ArrayList to transform it back to the original data types. 2. Background.

Nov 4, 2023 · How to create an ArrayList object in Java? We can create an ArrayList object by using new and its constructors. ArrayList a=new ArrayList(); The constructor of the ArrayList in Java. There are the following constructors of the ArrayList in Java: ArrayList a=new ArrayList();

Dec 20, 2024 · The ArrayList class in Java is part of the java.util package and provides a resizable array implementation. Unlike regular arrays in Java, which have a fixed size, an ArrayList can dynamically grow or shrink as needed.

Dec 14, 2024 · In this quick article, we had a look at the ArrayList in Java. We showed how to create an ArrayList instance, and how to add, find, or remove elements using different approaches. Furthermore, we showed how to add, get, and remove the first, or the last element using sequenced collections introduced in Java 21.

Apr 7, 2025 · Below are the various methods to initialize an ArrayList in Java. 1. Initialization with add () Syntax: ArrayList<Type> al= new ArrayList<Type> (); al.add (“Geeks”); al.add (“for”); al.add (“Geeks”); Example 1: This example demonstrates how to …