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ArrayList in Java can be initialized in several ways. Here are some common methods:
Using add() Method
You can initialize an ArrayList by adding elements one by one using the add() method.
import java.util.ArrayList;public class Main {public static void main(String[] args) {ArrayList<String> list = new ArrayList<>();list.add("Geeks");list.add("for");list.add("Geeks");System.out.println("ArrayList: " + list);}}Kopiert!✕KopierenUsing Arrays.asList()
You can use Arrays.asList() to initialize an ArrayList with predefined values.
import java.util.ArrayList;import java.util.Arrays;public class Main {public static void main(String[] args) {ArrayList<String> list = new ArrayList<>(Arrays.asList("Geeks", "for", "Geeks"));System.out.println("ArrayList: " + list);}}Kopiert!✕KopierenUsing List.of()
From Java 9 onwards, you can use List.of() to create an immutable list and then pass it to the ArrayList constructor.
java - Initialization of an ArrayList in one line - Stack Overflow
17. Juni 2009 · Usually you should just declare variables by the most general interface that you are going to use (e.g. Iterable, Collection, or List), and initialize them with the specific implementation …
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Codebeispiel
ArrayList<String> list = new ArrayList<String>();list.add("A");list.add("B");list.add("C");Initialize an ArrayList in Java - GeeksforGeeks
11. Juli 2025 · ArrayList inherits the AbstractList class and implements the List interface. ArrayList is initialized by a size, however, the size can increase if the …
Initializing an ArrayList in Java: A Comprehensive Guide
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10. Nov. 2025 · Over the years, Java has introduced new features (like `List.of ()` in Java 9) and libraries (like Guava) that simplify one-line initialization. This blog explores the best methods to initialize an …
Initialize an ArrayList in Java - HowToDoInJava
- Creating and initializing the ArrayList in different statements sometimes seems to generate unnecessary boilerplate code. We can optimize the ArrayListcreation using the following ways.
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