import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class Shoofle extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    HttpSession session = request.getSession(); 

    String message        = (String) session.getAttribute("message"), 
           anotherMessage = ""; 

    if (message == null) message = ""; 

    java.util.StringTokenizer st = new java.util.StringTokenizer(message); 

    if (st.hasMoreTokens()) {

      String first = st.nextToken(); 

      message = ""; 
      while (st.hasMoreTokens()) {
        message += " " + st.nextToken(); 
      }
 
      anotherMessage = "You are looking at: " + first; 

    } else { // initialize 

      String[] a = {"one", "two", "three", "four", "five", "six"};

      for (int n = 0; n < 1000; n++) {
        int i = (int) (Math.random() * a.length); 
        int j = (int) (Math.random() * a.length); 
        String temp = a[i]; 
        a[i] = a[j]; 
        a[j] = temp; 
      } 

      anotherMessage = "The game has just (re)started. The deck is shuffled."; 

      message = a[0]; 
      for (int i = 1; i < a.length; i++) {
        message += " " + a[i]; 
      } 

    } 

    session.setAttribute("message", message); 
 
    out.println(

      "  This is the servlet, not the jsp. <p> <form> \n" + 
      "    " + anotherMessage + " <p> \n" + 
      "    Current list: (" + message + ") <p> \n" + 
      "    <input type=\"submit\" value=\"Proceed\"> \n" + 
      "  </form> " 

    ); 

  } // doGet

} // class Shuffle