Java Newbie needs help with multi method dialog calculator

Question

Our example for the unit was the example below... we now must create a 5 method program for a calculator... 1 main method and 4 for the standard operations(+ - * /). It is supposed to utilize Swing for graphics/dialog boxes that ask you for the operation you would like to use(if statements based on which operation they enter), and a prompt that asks you separately for the 2 numbers used.... anyone feel like drawing this skeleton out? I am in class right now and none of my neighbors can figure it out either....
import javax.swing.JOptionPane;
public class Payroll
     public static void main(String[] args)
     String name;         //the user's name
     String inputString;  //holds input
     int hours;           //hours worked
     double payRate;      //hourly pay wage
     double grossPay;     //total pay
     //getUser
     name = JOptionPane.showInputDialog("What is your name?");
     //getHours
     inputString = JOptionPane.showInputDialog("How many hours did you work?");
     hours = Integer.parseInt(inputString);
     //getRate
     inputString = JOptionPane.showInputDialog("What is your hourly pay rate?");
     payRate = Double.parseDouble(inputString);
     //setGross
     grossPay = payRate * hours;
     //showGross
     JOptionPane.showMessageDialog(null, "Hello " + name + ". Your gross pay is: " + grossPay); 
     //End
     System.exit(0);
}

Answer 1

import javax.swing.JOptionPane;
public class CalcDiag
     public static void main(String[] args)
     String operation;
     String inputString;
     double num1, num2, total=0;
     inputString = JOptionPane.showInputDialog("What is your first number?");
     num1 = Double.parseDouble(inputString);
     inputString = JOptionPane.showInputDialog("What is your second number?");
     num2 = Double.parseDouble(inputString);
     inputString = JOptionPane.showInputDialog("Please indicate which operation you would like to use: A,S,M,D ?");
     operation = inputString;
     if (operation.equals("A"))
          total = getAdd(num1, num2);
     if (operation.equals("S"))
          total = getSub(num1, num2);
     if (operation.equals("M"))
          total = getMult(num1, num2);
     if (operation.equals("D"))
          total = getDiv(num1, num2);
     JOptionPane.showMessageDialog(null,"Total = "+total);
     System.exit(0);
public static double getAdd(double x, double y)
          return x+y;
public static double getSub(double x,double y)
          return x-y;
public static double getMult(double x, double y)
          return x*y;
public static double getDiv(double x, double y)
          return x/y;
}your welcome