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Home Forums How to create ArrayList in Java? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 22 Jul 2023
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There are two ways to create an array list in Java:

  • Using the ArrayList() constructor. The ArrayList() constructor creates an empty array list.
ArrayList<String> arrayList = new ArrayList<>();
  • Using the add() method. The add() method adds an element to the end of the array list.
ArrayList<String> arrayList = new ArrayList<>();
arrayList.add("Hello");

Here is an example of how to create an array list and add some elements to it:

import java.util.ArrayList;

public class ArrayListExample {

  public static void main(String[] args) {
    // Create an empty array list
    ArrayList<String> arrayList = new ArrayList<>();

    // Add some elements to the array list
    arrayList.add("Hello");
    arrayList.add("World");

    // Print the array list
    System.out.println(arrayList);
  }
}

Output:

[Hello, World]

Here are some important things to note about creating array lists:

  • Array lists are dynamic data structures, which means that they can grow or shrink as needed.
  • Array lists are not synchronized, which means that they are not thread-safe.
  • Array lists are implemented using a linked list, which means that they are not as efficient as arrays for storing large amounts of data.
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