How to Access Elements of ArrayList in Java

Java ArrayList Examples


Array Methods with Examples


This example demonstrates how to access elements of ArrayList in Java.

How to Access Elements of ArrayList in Java

This example shows:
  1. Access the element at a particular index in an ArrayList using the get() method.
  2. Modify the element at a particular index in an ArrayList using the set() method.
import java.util.ArrayList;
import java.util.List;

public class AccessElementsFromArrayListExample {
    public static void main(String[] args) {
        List<String> topCompanies = new ArrayList<>();

        topCompanies.add("Google");
        topCompanies.add("Apple");
        topCompanies.add("Microsoft");
        topCompanies.add("Amazon");
        topCompanies.add("Facebook");

        // Find the size of an ArrayList
        System.out.println("Here are the top " + topCompanies.size() + " companies in the world");
        System.out.println(topCompanies);

        // Retrieve the element at a given index
        String bestCompany = topCompanies.get(0);
        String secondBestCompany = topCompanies.get(1);
        String lastCompany = topCompanies.get(topCompanies.size() - 1);

        System.out.println("Best Company: " + bestCompany);
        System.out.println("Second Best Company: " + secondBestCompany);
        System.out.println("Last Company in the list: " + lastCompany);

        // Modify the element at a given index
        topCompanies.set(4, "Walmart");
        System.out.println("Modified top companies list: " + topCompanies);
    }
}

Output

Here are the top 5 companies in the world
[Google, Apple, Microsoft, Amazon, Facebook]
Best Company: Google
Second Best Company: Apple
Last Company in the list: Facebook
Modified top companies list: [Google, Apple, Microsoft, Amazon, Walmart]

Reference


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