Java ArrayList

Java’s ArrayList is one of the most widely used data structures in the Java Collection Framework (JCF). It provides a dynamic array that can grow and shrink in size, making it more flexible than a standard Java array. In this article, we will explore ArrayLists in detail, covering their creation, methods, advantages, and best practices.

What is an ArrayList?

An ArrayList is a resizable array implementation of the List interface in Java. Unlike traditional arrays, which have a fixed size, an ArrayList automatically adjusts its size when elements are added or removed.

 Key Features of ArrayList:

1. Dynamic Sizing
2. Fast Element Access
3. Ordered Elements
4. Allows Duplicates
5. Allows Null Values

How to Create an ArrayList in Java

To use an ArrayList, you need to import the java.util.ArrayList package. Here’s how you declare and initialize an ArrayList:

import java.util.ArrayList;

public class ArrayListExample {
    public static void main(String[] args) {
        // Creating an ArrayList of Strings
        ArrayList<String> courses= new ArrayList<>();
        
        // Adding elements to the ArrayList
        courses.add("Java");
        courses.add("Php");
        courses.add("Jsp");
        
        // Displaying the ArrayList
        System.out.println("Courses: " + courses);
    }
}