hello guys, this is my first post well I'm having this problem with my program.. for me its a big problem but I don't know about you guys if its just a simple one.. anyway here's my program..

Code:

/**
 * @Sta. Maria, Jerome Augustus S.
 * @version 1.00 2011/11/15
 */

import java.util.*;

public class Review {

   public static void main(String[] args) {

      Scanner keyboard = new Scanner(System.in);

      Introduction();
      keyboard.nextLine();
      System.out.println("\n");

      double operand1, operand2, runningResult=0;

      char operator='x';

      System.out.print("Enter a number: ");
      operand1 = Double.parseDouble(keyboard.nextLine());
      boolean firstOperator = true;


      while(operator != '=') {

         operator = readOperator();

         if(firstOperator && operator == '=') {

            System.out.println("cannot be the first operator");
            operator = 'x';
            continue;
         }

         firstOperator = false;

         switch(operator) {


            case '*':
               System.out.print("Enter a number: ");
               operand2 = Double.parseDouble(keyboard.nextLine());
               runningResult = multiply(operand1, operand2);
               System.out.println("Running Result: " + runningResult);
               continue;

            case '/':
               System.out.print("Enter a number: ");
               operand2 = Double.parseDouble(keyboard.nextLine());
               runningResult = divide(operand1, operand2);
               System.out.println("Running Result: " + runningResult);
               continue;

            case '+':
               System.out.print("Enter a number: ");
               operand2 = Double.parseDouble(keyboard.nextLine());
               runningResult = addition(operand1, operand2);
               System.out.println("Running Result: " + runningResult);
               continue;

            case '-':
               System.out.print("Enter a number: ");
               operand2 = Double.parseDouble(keyboard.nextLine());
               runningResult = subtraction(operand1, operand2);
               System.out.println("Running Result: " + runningResult);
               continue;

            case '=':
               System.out.println("Final Result: " + runningResult);
               break;
         }
      }

   }

   public static double multiply(double n1, double n2) {

      return n1*n2;
   }

   public static double  divide(double n1, double n2) {

      return n1/n2;
   }

   public static double  addition(double n1, double n2) {

      return n1+n2;
   }
   public static double  subtraction(double n1, double n2) {

      return n1-n2;
   }

   public static char readOperator() {

      Scanner keyboard = new Scanner(System.in);

      char operator = 'x';

      do {

         System.out.print("Enter an arithmetic operator: ");
         operator = keyboard.nextLine().charAt(0);

         if(operator != '+' && operator != '-'&& operator != '*' && operator != '/'&& operator != '=') {

            System.out.println("You must enter +, -, *, / or =");
         }

         }while(operator != '+' &&operator != '-'&& operator != '*' && operator != '/' && operator != '=');

         return operator;
      }

    public static void Introduction(){

      System.out.println("\n\n\n");
      System.out.println("==============================================");
      System.out.println("College of Information and Computing Sciences ");
      System.out.println("            Saint Louis University         ");
      System.out.println("                  Baguio City                ");
      System.out.println("----------------------------------------------");
      System.out.println("                  Programmer                ");
      System.out.println("        Jerome Augustus S. Sta. Maria        ");
      System.out.println("                    11/15/11                  ");
      System.out.println("==============================================");
      System.out.println("\n");
      System.out.print("Press enter to continue...");

    }

}


===========================================================

What I want is the output should be like this:

Sample run:
Enter a number: 10
Enter an arithmetic operator: +
Enter a number: 5
Running result = 15
Enter an arithmetic operator: *
Enter a number: 2
Running result = 30
Enter an arithmetic operator: -
Enter a number: 10
Running result = 20
Enter an arithmetic operator: *
Enter a number: 3
Running result = 60
Enter an arithmetic operator: /
Enter a number: 5
Running result = 12
Enter an arithmetic operator: +
Enter a number: 88
Running result = 100
Enter an arithmetic operator: =
Final result = 100

========================

I appreciate for the help.. Thank You!