Example: Reverse String using Two Pointers on charArray in Java

// Reverse String using Two Pointers on charArray
public class Main {
    public static void main(String[] args) {
        String originalString = "world";

        // Step 1: Convert the original string to a character array
        char[] charArray = originalString.toCharArray();

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

        // Step 3: Loop while the left pointer is less than the right pointer
        while (left < right) {
            // Step 4: Swap characters at 'left' and 'right' positions
            char temp = charArray[left];
            charArray[left] = charArray[right];
            charArray[right] = temp;

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

        // Step 6: Convert the character array back to a string
        String reversedString = new String(charArray);

        System.out.println("Original String: " + originalString);
        System.out.println("Reversed String: " + reversedString);
    }
}