Example: Array Reversal with Collections.reverse() in Java

// Array Reversal with Collections.reverse()
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        Integer[] originalArr = {1, 2, 3, 4, 5}; // Must use Wrapper type for List
        System.out.println("Original Array: " + Arrays.toString(originalArr));

        // Step 1: Convert the array to a List
        // Arrays.asList returns a fixed-size list backed by the array.
        // To allow modification (like reversal), it's often better to create a new ArrayList.
        List<Integer> list = new ArrayList<>(Arrays.asList(originalArr));
        
        System.out.println("List before reversal: " + list);

        // Step 2: Use Collections.reverse() method
        Collections.reverse(list);

        System.out.println("Reversed List: " + list);

        // Optional: Convert back to an array if needed
        Integer[] reversedArr = list.toArray(new Integer[0]);
        System.out.println("Reversed Array (from List): " + Arrays.toString(reversedArr));
    }
}