reversing words of a string using stacks

i have succeeded in tokenizing and reversing the individual words using stacks but each word is a mirror of itself. how do i change it
i want "electrical engineering department " to be "department engineering electrical"

here goes my code

import java.util.StringTokenizer;
import java.util.Scanner;
import java.util.Stack;

public class ReverseWords{
public static void main (String args[]){

Scanner scan = new Scanner(System.in);
String original = scan.nextLine();
StringTokenizer string = new StringTokenizer(original);

Stack<Character> charStack = new Stack<Character>();

while (string.hasMoreTokens()){

String temp = string.nextToken();

for (int i = 0; i < temp.length(); i ++){

charStack.push(temp.charAt(i));
}
charStack.push(' ');
}

StringBuilder result = new StringBuilder();
while(!charStack.empty()){
result.append(charStack.pop());

}

System.out.println(result.toString());

}

}