/*
   Chapter 4:  Ch 4 W/T (Sales Commission)
   Programmer: Brad Shedd
   Date:    May 03, 2006
   File:    Commission.java
   Purpose: This Program calculates sales commission using five methods:
            getSales(), getCode(), getComm(), output(), and finish().
*/

import javax.swing.JOptionPane;
import java.text.DecimalFormat;

public class Commission
{
   public static void main(String[]arg)
   {
      //declare class variables
      double dollars, answer;
      int empCode;

      //Call methods
      dollars = getSales();
      empCode = getCode();
      answer = getComm(dollars, empCode);
      output(answer, dollars);
      finish();
   }

   //The getSales() method asks the user to input a dollar amount and validates it.
   public static double getSales()
  {
      //declare method variables
      double sales = 0.0;
      boolean done = false;

      // loop while not done
      while (!done)
      {

         String answer = JOptionPane.showInputDialog(null,"Enter the sales amount\n(do not use commas or dollar signs)\n or click Cancel to exit:");

         if (answer == null) finish();

         try
         {
            sales = Double.parseDouble(answer);
            if (sales <= 0) throw new NumberFormatException();
            else done = true;
         }
         catch(NumberFormatException e)
         {
            JOptionPane.showMessageDialog(null,"Your entry was not in the proper format.","Error",JOptionPane.INFORMATION_MESSAGE);
         }
      }
      return sales;
   }
   //The getCode() method retrives a code form the user and validates it.
   public static int getCode()
   {
      //declare method variables
      int code = 0;
      boolean done = false;

     //loop while not done
      while (!done)
      {
         try
         {
            String message = "Enter the commission code:" + "\n\n1) Telephone Sales\n2) In-Store Sales\n3) Outside Sales\n\n";

            code = Integer.parseInt(JOptionPane.showInputDialog(null,message));

            //test for valid codes 1, 2 or 3
            if (code<1 || code>3) throw new NumberFormatException();
            else done = true;
         }
         catch(NumberFormatException e)
         {
            JOptionPane.showMessageDialog(null,"Please enter a 1, 2, or 3.", "Error",JOptionPane.INFORMATION_MESSAGE);
         }
      }
      return code;
   }

   //The getComm() method accepts the dollars and code and returns the commission.
   public static double getComm(double employeeSales, int employeeCode)
   {
      double commission = 0.0;

      switch(employeeCode)
      {
         case 1:
            commission = .10 * employeeSales;
            break;

         case 2:
            commission = .14 * employeeSales;
            break;

         case 3:
            commission = .18 * employeeSales;
            break;
      }
      return commission;
   }

   //The output() method displays the commission and sales.
   public static void output(double commission, double sales)
   {
      DecimalFormat twoDigits = new DecimalFormat("$#,000.00");

      JOptionPane.showMessageDialog(null,"Your commission on sales of "+ twoDigits.format(sales) + " is " + twoDigits.format(commission),"Commission Totals",JOptionPane.INFORMATION_MESSAGE);
   }
  //The finish() method ends the program.
   public static void finish()
   {
      System.exit(0);
   }
}// end commission

Homepage