ArrayList

import java.util.*;
 
public class ArrayListDocumentation {
   
    // Main driver method
    public static void main(String[] args)
    {
        // Implementing the list interface as an arraylist
        // Note: You can't instantiate an object of the List class.
        // The List interface describes a collection and supports things like iteration, or adding/deleting
        // ArrayList implements the List
        List<String> brands = new ArrayList<String>();
       
        // Adding elements to ArrayList
        brands.add("Honda");
        brands.add("Toyota");
        brands.add("Tesla");

        System.out.println("Using the .add method 3 times.");
        System.out.println(brands);
        System.out.println();

        // Using addAll method to add multiple elements to the ArrayList at once
        List<String> newBrands = new ArrayList<String>();
        newBrands.add("BMW");
        newBrands.add("Porsche");
        newBrands.add("Nissan");
        brands.addAll(newBrands);
        System.out.println("Using the .addAll method to add 3 brands.");
        System.out.println(brands);


    }
}
ArrayListDocumentation.main(null);

Using the .add method 3 times.
[Honda, Toyota, Tesla]

Using the .addAll method to add 3 brands.
[Honda, Toyota, Tesla, BMW, Porsche, Nissan]