Java ArrayList

Java ArrayList

In Java, ArrayList is a part of the java.util package and provides a resizable array implementation backed by an array. It dynamically grows and shrinks as elements are added or removed. Here's a basic overview of how to use ArrayList:

        import java.util.ArrayList;

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

        // Add elements to the ArrayList
        list.add("Apple");
        list.add("Banana");
        list.add("Orange");

        // Access elements in the ArrayList
        System.out.println("Elements in the ArrayList:");
        for (String fruit : list) {
            System.out.println(fruit);
        }

        // Get the size of the ArrayList
        int size = list.size();
        System.out.println("Size of the ArrayList: " + size);

        // Remove an element from the ArrayList
        list.remove("Banana");

        // Check if an element exists in the ArrayList
        boolean containsOrange = list.contains("Orange");
        System.out.println("ArrayList contains Orange: " + containsOrange);

        // Clear all elements from the ArrayList
        list.clear();

        // Check if the ArrayList is empty
        boolean isEmpty = list.isEmpty();
        System.out.println("ArrayList is empty: " + isEmpty);
    }
}
      

This example demonstrates creating an ArrayList, adding elements to it, accessing elements, getting the size, removing elements, checking if an element exists, clearing the ArrayList, and checking if it's empty. ArrayList provides many more methods for manipulation and retrieval of elements.