Example: String Reversal using StringBuilder in Java

// String Reversal using StringBuilder
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Initialize the original string
        String originalString = "Hello World";
        System.out.println("Original String: " + originalString);

        // Step 2: Create a StringBuilder object from the original string
        StringBuilder stringBuilder = new StringBuilder(originalString);

        // Step 3: Use the reverse() method to reverse the StringBuilder's contents
        stringBuilder.reverse();

        // Step 4: Convert the reversed StringBuilder back to a String
        String reversedString = stringBuilder.toString();

        // Step 5: Print the reversed string
        System.out.println("Reversed String: " + reversedString);

        // Example with user input
        Scanner scanner = new Scanner(System.in);
        System.out.print("\nEnter a string to reverse: ");
        String userInput = scanner.nextLine();
        
        StringBuilder userStringBuilder = new StringBuilder(userInput);
        userStringBuilder.reverse();
        String userReversedString = userStringBuilder.toString();
        
        System.out.println("Original (User Input): " + userInput);
        System.out.println("Reversed (User Input): " + userReversedString);
        
        scanner.close();
    }
}