Need some help creating a GUI

Question

I'm creating a program that allows you to order a pizza. It is a border layout with section containing different grid layouts that are contained within there own classes in separate files. My question is that I'd like to produce a running total for the cost of the pizza but I'm having trouble getting the classes to "talk" to each other. How would I go about being able to access a double value that is in one class and use it in another class?

Answer 1

Thanks for the input. I think I've got that part of the program figured out, now my problem is how to add an action listener to a JComboBox. What I have is a combobox that represents the quantity of pizzas to be ordered. All I need it to do is set the variable Quant equal to the current selection but I'm having a hard time calling the current selection. Here's what I've got so far
//  QuantityPanel
//  Sets up the quantity panel
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class QuantityPanel extends JPanel
     public static double sodaPrice = 1.5;
     public static int Quant;
   public QuantityPanel()
      setLayout (new GridLayout(10, 1,0,0));
          JLabel quantity, beverages, space;
          quantity = new JLabel ("Number of Pizzas:");
          beverages = new JLabel ("Beverages:");
          space = new JLabel ();
          int choices[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
          String bev[] = {"Pepsi", "Mt. Dew", "Dr. Pepper", "Sierra Mist", "Root Beer",
                              "Water"};
          JComboBox numpizzas = new JComboBox();
          JComboBox beverage = new JComboBox();
          for (int i=0;i<choices.length;i++)
               numpizzas.addItem (choices);
          for (int x=0;x<bev.length;x++)
               beverage.addItem (bev[x]);
          numpizzas.addActionListener (new ComboListener());
          add (quantity);
          add (numpizzas);
          add (space);
          add (beverages);
          add (beverage);
          private class ComboListener implements ActionListener
               public void actionPerformed (ActionEvent event)
                    if (current == 1)
                    Quant = 1;
                    else Quant = 1;
                    if (current == 2)
                    Quant = 2;
                    else Quant = 1;
                    if (current == 3)
                    Quant = 3;
                    else Quant = 1;
                    if (current == 4)
                    Quant = 4;
                    else Quant = 1;
                    if (current == 5)
                    Quant = 5;
                    else Quant = 1;
                    if (current == 6)
                    Quant = 6;
                    else Quant = 1;
                    if (current == 6)
                    Quant = 6;
                    else Quant = 1;
                    if (current == 7)
                    Quant = 7;
                    else Quant = 1;
                    if (current == 8)
                    Quant = 8;
                    else Quant = 1;
                    if (current == 9)
                    Quant = 9;
                    else Quant = 1;
                    if (current == 10)
                    Quant = 10;
                    else Quant = 1;