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  1. 123

    An Array of ArrayLists in Java is a data structure where each element of the array is an ArrayList. This allows for dynamic resizing and flexible storage of elements.

    Example

    import java.util.ArrayList;

    public class Main {
    public static void main(String[] args) {
    int n = 5;
    ArrayList<Integer>[] arrayOfArrayLists = new ArrayList[n];

    for (int i = 0; i < n; i++) {
    arrayOfArrayLists[i] = new ArrayList<>();
    }

    arrayOfArrayLists[0].add(1);
    arrayOfArrayLists[0].add(2);
    arrayOfArrayLists[1].add(5);
    arrayOfArrayLists[2].add(10);
    arrayOfArrayLists[2].add(20);
    arrayOfArrayLists[2].add(30);
    arrayOfArrayLists[3].add(56);
    arrayOfArrayLists[4].add(34);
    arrayOfArrayLists[4].add(67);
    arrayOfArrayLists[4].add(89);
    arrayOfArrayLists[4].add(12);

    for (int i = 0; i < n; i++) {
    for (int j = 0; j < arrayOfArrayLists[i].size(); j++) {
    System.out.print(arrayOfArrayLists[i].get(j) + " ");
    }
    System.out.println();
    }
    }
    }
    Gekopieerd.

    Important Considerations

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  2. W3School
    https://www.w3schools.com ā€ŗ java ā€ŗ java_arraylist.aspDit resultaat vertalen

    Java ArrayList - W3Schools

    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 pā€¦
    Java Arraylist

    The ArrayList class is a resizable array, which can be found in the java.utilpackage. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you want to add or remove elements to/from an array, ā€¦

    Add Items

    The ArrayList class has many useful methods. For example, to add elements to the list, use the add()method: You can also add an item at a specified position by referring to the index number:

    Remove An Item

    To remove an element, use the remove()method and refer to the index number: To remove all the elements in the ArrayList, use the clear()method:

    Loop Through An Arraylist

    Loop through the elements of an ArrayList with a for loop, and use the size()method to specify how many times the loop should run: You can also loop through an ArrayList with the for-eachloop:

  3. Stack Overflow
    https://stackoverflow.com ā€ŗ questionsDit resultaat vertalen

    ArrayList of int array in java - Stack Overflow

    7 mei 2012 · Just to note: ArrayList doesn't mean "List of Arrays" but rather a list that uses an array internally. So you could use ArrayList<Integer> and add your values: arl.add(Integer.valueOf(1); ...

    • Recensies: 2
      arrays - Java ArrayList for integers19 jan. 2013
      Why can't I have 'int' as the type of an ArrayList?15 jan. 2013
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    • oracle.com
      https://docs.oracle.com ā€ŗ javase ā€ŗ docs ā€ŗ api ā€ŗ java ā€ŗ util ā€ŗ ArrayList.ā€¦Dit resultaat vertalen

      ArrayList (Java Platform SE 8 ) - Oracle Help Center

      Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods ā€¦

    • Dot Net Perls
      https://www.dotnetperls.com ā€ŗ arraylist-integer-javaDit resultaat vertalen

      Java - ArrayList int, Integer Examples - Dot Net Perls

      1 okt. 2025 · ArrayList, int An ArrayList contains many elements. But in Java 8 it cannot store values. It can hold classes (like Integer) but not values (like int). To place ints in ArrayList, we must convert ā€¦

    • GeeksForGeeks
      https://www.geeksforgeeks.org ā€ŗ java ā€ŗ arraylist-in-javaDit resultaat vertalen

      ArrayList in Java - GeeksforGeeks

      17 mrt. 2026 · Explanation: This program creates an ArrayList of integers, adds elements to it using the add () method, and stores them dynamically. Finally, it prints the elements in insertion order as [1, 2, 3].

    • javaspring.net
      https://www.javaspring.net ā€ŗ blog ā€ŗ int-arraylist-javaDit resultaat vertalen

      Mastering `ArrayList` of Integers in Java - javaspring.net

      16 jan. 2026 · This blog post will delve into the fundamental concepts of using an `ArrayList` for integers in Java, cover various usage methods, explore common practices, and share best practices to help ā€¦

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    • The Developer Blog
      https://thedeveloperblog.com ā€ŗ java ā€ŗ arraylist-intā€¦Dit resultaat vertalen

      Java ArrayList int, Integer Example - The Developer Blog

      Use an ArrayList of Integer values to store int values. An ArrayList cannot store ints. | TheDeveloperBlog.com

    • Programiz
      https://www.programiz.com ā€ŗ java-programminā€¦Dit resultaat vertalen

      Java ArrayList (With Examples) - Programiz

      The ArrayList class is used to implement resizable-arrays in Java. In this tutorial, we will learn about the ArrayList class and its methods with the help of examples.

    • Baeldung
      https://www.baeldung.com ā€ŗ java-arraylistDit resultaat vertalen

      Guide to the Java ArrayList - Baeldung

      14 dec. 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 ā€¦

    • javathinking.com
      https://www.javathinking.com ā€ŗ blog ā€ŗ why-can-t-i-have-int-as-the-tyā€¦Dit resultaat vertalen

      Why Can't You Use 'int' as the Type for an ArrayList in Java ...

      17 jan. 2026 · In this blog, weā€™ll demystify this issue by exploring Javaā€™s type system, the nature of ArrayList, and the critical distinction between primitive and reference types. Weā€™ll also explain why the ā€¦

    • Verkrijg uitgebreide informatie over Java ArrayList Int

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