Example: Reverse Array In-Place (Swapping Elements) in Java

// Reverse Array In-Place (Swapping Elements)
import java.util.Arrays; // Required for Arrays.toString()

public class Main {
    public static void main(String[] args) {
        // Step 1: Declare and initialize the array
        int[] myArray = {10, 20, 30, 40, 50, 60};
        System.out.println("Original Array: " + Arrays.toString(myArray));

        // Step 2: Initialize two pointers, one at the start and one at the end
        int left = 0;
        int right = myArray.length - 1;

        // Step 3: Loop until the pointers meet or cross
        while (left < right) {
            // Step 4: Swap elements at the left and right pointers
            int temp = myArray[left];
            myArray[left] = myArray[right];
            myArray[right] = temp;

            // Step 5: Move pointers towards the center
            left++;
            right--;
        }

        // Step 6: Print the reversed array
        System.out.println("Reversed Array (in-place): " + Arrays.toString(myArray));
    }
}