How convert integer into string

Question

Hi,
I need to convert answer3 from double into String
answer3 = Double.parseDouble(dij3)/(1 + Math.pow(( Double.parseDouble(tesside_luas_i) / Double.parseDouble(tesside_luas_j) ),0.5847));

Answer 1

Now the integer value is string but why i cannot get valur from my servlet to my web page
package net.mybizaid.isodms.servlet;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import net.mybizaid.isodms.*;
public class SPLDataInputServlet extends HttpServlet {
     public void doPost (HttpServletRequest request, HttpServletResponse response)
     throws IOException, ServletException
System.out.println( "******************** Calculation Servlet ******************" );
               String dij     ;
               String population_i ;
               String population_j ;
               String project_name = "";
               String project_status = "";
               double answer;
               String handler = "";
               String url                    = "";
               double answer3;
               String dij3 ="";
               String tesside_luas_i ="";
               String tesside_luas_j ="";
               double answer2;
               String dij2 ="";
               String luas_i ="";
               String luas_j ="";
               String counter                    = "";
               String i                                   = "";
               handler                          = request.getParameter( "handler" );
               dij                    = request.getParameter("dij");
               population_i               = request.getParameter("population_i");
               population_j               =     request.getParameter( "population_j");
               project_name               =     request.getParameter( "project_name");
               project_status               =     request.getParameter( "project_status");
               dij2                    = request.getParameter("dij2");
               luas_i               = request.getParameter("luas_i");
               luas_j               =     request.getParameter( "luas_j");
               dij3                    = request.getParameter("dij3");
               tesside_luas_i               = request.getParameter("tesside_luas_i");
               tesside_luas_j               =     request.getParameter( "tesside_luas_j");
               HttpSession session = null;
               session = request.getSession(true);
               int cnt = counter != null && !counter.equals("") ? Integer.parseInt(counter) : 0;
               int ii = i != null && !i.equals("") ? Integer.parseInt(i) : 0;
//Tesside
if (handler != null && !handler.equals( "" ) && handler.equals( "cal3" ))
               try
System.out.println("The DIJ3 value is :"+dij3);
System.out.println("The tesside_luas_i value is :"+tesside_luas_i);
System.out.println("The tesside_luas_j value is :"+tesside_luas_j);
                    answer3 = Double.parseDouble(dij3)/(1 + Math.pow(( Double.parseDouble(tesside_luas_i) / Double.parseDouble(tesside_luas_j) ),0.5847));
                    String str = String.valueOf( answer3 );
System.out.println("The answer value is :"+str);
                     url = "/jsp/model/tessideAnswer.jsp";
                     dispatchErrorMsg( request, response, url, "" );
          catch (Exception e)
                    request.setAttribute("pd.errorMessage", e.getMessage());
                    dispatchErrorMsg( request, response, "/jsp/Error.jsp", e.getMessage() );
//PotensiPasaran
if (handler != null && !handler.equals( "" ) && handler.equals( "cal2" ))
               try
System.out.println("The DIJ2 value is :"+dij2);
System.out.println("The luas_i value is :"+luas_i);
System.out.println("The luas_j value is :"+luas_j);
                    answer2 = Double.parseDouble(dij2)/(1 + Math.sqrt(( Double.parseDouble(luas_i) / Double.parseDouble(luas_j) )));
System.out.println("The answer value is :"+answer2);
                     url = "/jsp/model/potensiPasaranAnswer.jsp";
                     dispatchErrorMsg( request, response, url, "" );
          catch (Exception e)
                    request.setAttribute("pd.errorMessage", e.getMessage());
                    dispatchErrorMsg( request, response, "/jsp/Error.jsp", e.getMessage() );
//Reilly
     if (handler != null && !handler.equals( "" ) && handler.equals( "add" ))
               try
                    System.out.println("The DIJ value is :"+dij);
                    System.out.println("The population_i value is :"+population_i);
                    System.out.println("The population_j value is :"+population_j);
                    answer = Double.parseDouble(dij)/(1 + Math.sqrt(( Double.parseDouble(population_i) / Double.parseDouble(population_j) )));
System.out.println("The answer value is :"+answer);
                     url = "/jsp/model/reillyAnswer.jsp";
                     dispatchErrorMsg( request, response, url, "" );
          catch (Exception e)
                    request.setAttribute("pd.errorMessage", e.getMessage());
                    dispatchErrorMsg( request, response, "/jsp/Error.jsp", e.getMessage() );
     public void doGet (HttpServletRequest request, HttpServletResponse response)
     throws IOException, ServletException
          doPost(request, response);
     }//end doGet
     public void dispatchErrorMsg(HttpServletRequest req, HttpServletResponse res,
                                                       String target, String message)
          try
               RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(target);
               req.setAttribute("eshop.ErrMessage",message);
               dispatcher.forward(req, res);
          catch (Exception e)
               System.err.println( e.getMessage() );
}//end class