Need help with calculating stock code.

/*This program was written by **** March 20, 2012 for CISM **** to show each person’s name, name of stock he or she purchased, the stock value, the amount of the stock commission, and the total amount paid for the stock.
*/
import javax.swing.JOptionPane;
import java.math.BigDecimal;
import java.text.NumberFormat;
import java.util.Locale;

public class Stock
{
public static void main(String[] args)
{
//Declare variables
int numberofShares = 0,priceperShare = 0,valueofShares=0;
BigDecimal amount;
double commission = 0.00, double totalStockcost = 0.00 double amtStockcommision = 0.00;
//Ask for First and Last name
String name = "";

First name = JOptionPane.showInputDialog(
null, "Please enter your first name: ");

LastName = JOptionPane.showInputDialog(
null, "Please enter your last name: "));

//Create list string to call later
String list =
"1 for Apple \n"+
"2 for Microsoft \n"+
"3 for DELL \n";

//Ask for the number corresponding to the Stock
String s2 = JOptionPane.showInputDialog(null, "Please pick a number corresponding to the stock that you bought: \n " + list);
stockNumber = Integer.parseInt(s1);

OK NEXT THING I WANT TO DO IS ASK HOW MUCH OF EACH STOCK SO IF THEY BUY 2 APPLE etc. how do i incorporate that??