1-ArrayList.txt

import java.util.ArrayList;
import java.util.Collections;

public class ArrayListDemo {
    public static void main(String[] args) {
        // Creating an ArrayList
        ArrayList<Integer> numbers = new ArrayList<>();

        // Adding elements to the ArrayList
        numbers.add(5);
        numbers.add(2);
        numbers.add(7);
        numbers.add(3);
        numbers.add(1);

        // Displaying the ArrayList before sorting
        System.out.println("ArrayList before sorting: " + numbers);

        // Sorting the elements of the ArrayList
        Collections.sort(numbers);

        // Displaying the ArrayList after sorting
        System.out.println("ArrayList after sorting: " + numbers);

        // Removing an element from the ArrayList
        numbers.remove(2); // Removing the element at index 2

        // Displaying the ArrayList after removing an element
        System.out.println("ArrayList after removing an element: " + numbers);

        // Illustrating the use of toArray() method
        Integer[] numbersArray = numbers.toArray(new Integer[0]);

        // Displaying the array obtained from toArray() method
        System.out.println("Array obtained from toArray() method:");
        for (Integer num : numbersArray) {
            System.out.println(num);
        }
    }
}


O/P:

ArrayList before sorting: [5, 2, 7, 3, 1]
ArrayList after sorting: [1, 2, 3, 5, 7]
ArrayList after removing an element: [1, 2, 5, 7]
Array obtained from toArray() method:
1
2
5
7