Reversing a String

ReversingString.java

/**
 * Author: Jane Ullah
 * Purpose: Reversing a string provided by the user.
 * Date: 12/18/2011
 */
import java.util.Scanner;

public class ReversingString {

	public static void main(String[] args) {
		//Accept user input
		Scanner keyboard = new Scanner(System.in);
		System.out.print("Please enter a string to be reversed: ");
		String userString = keyboard.nextLine();
		
		//StringBuffer to hold the reversed String
		StringBuffer newString = new StringBuffer();

                int placeholder = userString.length();	
		for (int i = (userString.length() - 1); i >= 0; i--)	{
                        //Assumes words are separated by spaces
			if (userString.charAt(i) == ' ')	{
				newString.append(userString.substring(i,placeholder).trim() + " ");
				placeholder = i;
			}
		}
		
		//Hold the final word
		newString.append(userString.substring(0,placeholder).trim());
		
		//Print the reversed String
		System.out.print(newString);
	}

}