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    To initialize an ArrayList in Java, you can use various methods. Here are some common ways:

    Using add() Method

    You can create an empty ArrayList and add elements to it using the add() method.

    ArrayList<String> list = new ArrayList<>();
    list.add("A");
    list.add("B");
    list.add("C");
    System.out.println(list); // Output: [A, B, C]
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    Using Arrays.asList()

    You can initialize an ArrayList with values using Arrays.asList().

    ArrayList<String> list = new ArrayList<>(Arrays.asList("A", "B", "C"));
    System.out.println(list); // Output: [A, B, C]
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    Using List.of() (Java 9+)

    You can use List.of() to create an immutable list and then pass it to the ArrayList constructor.

    ArrayList<String> list = new ArrayList<>(List.of("A", "B", "C"));
    System.out.println(list); // Output: [A, B, C]
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    Using Double Brace Initialization

    This method involves creating an anonymous subclass of ArrayList and initializing it in a single step.

    ArrayList<String> list = new ArrayList<String>() {{
    add("A");
    add("B");
    add("C");
    }};
    System.out.println(list); // Output: [A, B, C]
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    How to declare an ArrayList in Java?
    Declaration has to do with creating a data structure, while initialization involves assigning values to the data structure. Here's how you can declare an ArrayList in Java: To make use of an ArrayList, you must first import it from the ArrayList class: import java.util.ArrayList;. After that, you can create a new ArrayList object.
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    https://www.geeksforgeeks.org/java/initialize-an-arraylist-in-java
    Initialize an ArrayList in Java - GeeksforGeeks
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    java - Initialization of an ArrayList in one line - Stack Overflow

    17. Juni 2009 · * Implementation detail: It's a private nested class inside java.util.Arrays, named ArrayList, which is a different class from java.util.ArrayList, even though their simple names are the …

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      Codebeispiel

      ArrayList<String> list = new ArrayList<String>();
      list.add("A");
      list.add("B");
      list.add("C");
    • GeeksForGeeks
      https://www.geeksforgeeks.org › java › …Dieses Ergebnis übersetzen

      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 …

    • Baeldung
      https://www.baeldung.com › java-init-list-one-lineDieses Ergebnis übersetzen

      Java List Initialization in One Line - Baeldung

      We can create a Listfrom an array. And thanks to array literals, we can initialize them in one line: We can trust the varargs mechanism to handle the array creation. With that, we can write more concise and readable code: The result instance of this code implements the List interface, but it isn’t a java.util.ArrayList or a LinkedList. Instead, it’...
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      • Veröffentlicht: 15. Aug. 2018
      • tutorialpedia.org
        https://www.tutorialpedia.org › blog › initialization...Dieses Ergebnis übersetzen

        How to Initialize an ArrayList in One Line: Best Methods and ...

        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 …

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        Initializing an ArrayList in Java: A Comprehensive Guide

        12. Nov. 2025 · This blog post aims to cover all aspects of initializing an `ArrayList` in Java, including fundamental concepts, usage methods, common practices, and best practices.

      • HowToDoInJava
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        Initialize an ArrayList in Java - HowToDoInJava

        4. Aug. 2023 · To initialize an ArrayList in a single line statement, get all elements from an array using Arrays.asList method and pass the array argument to …

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        How to Initialize an ArrayList in Java – Declaration with Values

        21. Apr. 2023 · An ArrayList give you more control over the elements in a collection and has a dynamic size that isn't fixed on declaration like Java arrays. We saw how to declare and initialize an ArrayList …

      • GeeksForGeeks
        https://www.geeksforgeeks.org › java › …Dieses Ergebnis übersetzen

        Initializing a List in Java - GeeksforGeeks

        11. Okt. 2025 · It is part of Java.util.list package and implemented by ArrayList, LinkedList, Vector and Stack There are multiple ways to declare and initialize a …

      • Delft Stack
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        How to Initialize ArrayList in Java - Delft Stack

        2. Feb. 2024 · It is relatively easier to initialize a list instead of an ArrayList in Java with initial values in one line. However, if needed, it can be converted to an …

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        Initialize an ArrayList in Java - Online Tutorials Library

        Instead of putting elements manually one after the other into an ArrayList, we can initialize it through the asList () method for efficiency. This makes the code structure neater and more compact.

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