Jun 17, 2009 · There are alternatives, such as making an anonymous inner class with an instance initializer (also known as an "double brace initialization"): ArrayList<String> list = new ArrayList<String>() {{ add("A"); add("B"); add("C"); }};

Mar 12, 2015 · I want to declare anonymous arraylist in java so that on the nature of constructor list can be initialize with any type of object. For example: ArrayList<Anonymous> list; public.

Apr 22, 2022 · Is an array a primitive type or an object in Java? An array in Java without any name is known as an anonymous array. It is an array just for creating and using instantly. Using an anonymous array, we can pass an array with user values without the referenced variable. Properties of Anonymous Arrays: We can create an array without a name.

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 …

Apr 4, 2025 · With the outer braces, we declare an anonymous inner class that will be a subclass of the ArrayList. We can declare the details of our subclass inside these braces. As usual, we can use instance initializer blocks, and that is where the inner pair of braces comes from.

Apr 1, 2025 · This Tutorial Explains How to Declare, Initialize & Print Java ArrayList with Code Examples. You will also Learn about Implementation of ArrayList in Java.

When you use "double brace" initialization, you are creating an anonymous subclass of ArrayList with the outer braces, and the inner pair of braces represents the instance initializer, where you are calling add and printing out NAMES.

Dec 31, 2023 · # Arraylist Anonymous inner class It is one of the approaches to declare an anonymous inner class with the new ArrayList by double brace syntax. We can call the instance method directly, In this case add method is called.

In this tutorial, we'll see 4 methods to initialize an ArrayList in Java with examples: 1) Arrays.asList The method Arrays.asList takes a list of objects as input o1, o2...,on.

Mar 28, 2020 · You can provide either Set.of or List.of factory method, since Java 9, or Arrays.asList factory method to the ArrayList (Collection) constructor to create and init an ArrayList in one line. Apart from that, you can use add and addAll methods after the creation time to initialize an ArrayList.