Question

Java Question:

Describe what is an ArrayList (API) in Java. Provide an example code segment to describe as well.

Answer 1

In Java is used to store dynamically sized collection of elements. Contrary to Arrays that are fixed in size, an ArrayList grows its size automatically when new elements are added to it.ArrayList is a part of collection framework and is present in java.util package.

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import java.util.ArrayList;


public class Driver {

    public static void main(String[] args) {
        // Creating an ArrayList of String
        ArrayList<String> countries= new ArrayList<>();

            // Unlike array where we can store only fixed number of elements
           // in array list we can keep on adding elements without the
          // need to resize the array
         // ArrayList supports dynamic arrays that can grow as needed
        countries.add("US");
        countries.add("Brazil");
        countries.add("England");
        countries.add("China");


        System.out.println(countries);

        // Adding an element at a particular index in an ArrayList
          
        countries.add(2, "France");

        System.out.println(countries);



    }
}

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