public class ExerciseRunner { public static void main(String[] args) { LinkedList list = new DoubleLinkedList(); // Add elements to the list list.add(1); list.add(2); list.add(3); // Access elements by index System.out.println("Element at index 0: " + list.at(0)); // Expected output: 1 System.out.println("Element at index 1: " + list.at(1)); // Expected output: 2 System.out.println("Element at index 2: " + list.at(2)); // Expected output: 3 list.add(4); // Access elements by index System.out.println("Element at index 0: " + list.at(0)); // Expected output: 1 System.out.println("Element at index 1: " + list.at(1)); // Expected output: 2 System.out.println("Element at index 2: " + list.at(2)); // Expected output: 3 System.out.println("Element at index 3: " + list.at(3)); // Expected output: 4 // Remove an element by index list.remove(1); list.remove(2); System.out.println("List size : " + list.size()); // Expected output: 2 System.out.println("Element at index 1 after removal: " + list.at(1)); // Expected output: 3 } }