how do I give double values to the options from ChoixPizza, Small: 6.79, Medium: 8.29, Large: 9.49, Extra Large: 10.29, Party Square: 15.99 and give double values to ChoixBreuvage, Pop: 1.10, Jus: 1.35, Water: 1.00;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.border.TitledBorder;
import javax.swing.border.EtchedBorder;
import java.awt.Color;
import javax.swing.border.BevelBorder;
import javax.swing.border.CompoundBorder;
import javax.swing.border.LineBorder;
import javax.swing.UIManager;
import javax.swing.border.SoftBevelBorder;
import javax.swing.border.MatteBorder;
import java.awt.GridLayout;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.BoxLayout;
import java.awt.FlowLayout;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.awt.event.ActionEvent;

public class PizzaOrder extends JFrame {


	private JPanel contentPane;
	private JTextField NumPizza;
	private JTextField NumTopping;
	private JTextField NumBreuvage;
	private JButton Ajouter;
	private double subtotale;

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					PizzaOrder frame = new PizzaOrder();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();

				}
			}
		});

	}



	public PizzaOrder() {

		setTitle("Order");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 630, 689);
		contentPane = new JPanel();
		contentPane.setBackground(new Color(255, 147, 0));
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

		setContentPane(contentPane);
		contentPane.setLayout(null);

		JPanel Menu = new JPanel();
		Menu.setBackground(new Color(255, 147, 0));
		Menu.setBorder(new TitledBorder(new LineBorder(new Color(0, 0, 0)), "Menu", TitledBorder.LEADING, TitledBorder.TOP, null, new Color(0, 0, 0)));
		Menu.setBounds(6, 6, 618, 158);
		contentPane.add(Menu);
		Menu.setLayout(new GridLayout(0, 3, 0, 0));

		JPanel PizzaPrice = new JPanel();
		PizzaPrice.setBackground(new Color(255, 147, 0));
		PizzaPrice.setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null), "Pizza", TitledBorder.LEADING, TitledBorder.TOP, null, null));
		Menu.add(PizzaPrice);
		PizzaPrice.setLayout(null);

		JLabel PetitPizza = new JLabel("Petit: 6.79$");
		PetitPizza.setBounds(17, 21, 72, 16);
		PizzaPrice.add(PetitPizza);

		JLabel MoyenPizza = new JLabel("Moyen: 8.29$");
		MoyenPizza.setBounds(17, 40, 85, 16);
		PizzaPrice.add(MoyenPizza);

		JLabel LargePizza = new JLabel("Large: 9.49$");
		LargePizza.setBounds(17, 59, 85, 16);
		PizzaPrice.add(LargePizza);

		JLabel ExtraLargePizza = new JLabel("Extra Large: 10.29$");
		ExtraLargePizza.setBounds(17, 78, 127, 16);
		PizzaPrice.add(ExtraLargePizza);

		JLabel FetePizza = new JLabel("Fete: 15.99$");
		FetePizza.setBounds(17, 97, 93, 16);
		PizzaPrice.add(FetePizza);

		JPanel ToppingPrice = new JPanel();
		ToppingPrice.setBackground(new Color(255, 147, 0));
		ToppingPrice.setLayout(null);
		ToppingPrice.setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null), "Toppings", TitledBorder.LEADING, TitledBorder.TOP, null, new Color(0, 0, 0)));
		Menu.add(ToppingPrice);

		JLabel Petittopping = new JLabel("Petit: 1.20$");
		Petittopping.setBounds(17, 21, 72, 16);
		ToppingPrice.add(Petittopping);

		JLabel Moyentopping = new JLabel("Moyen: 1.40$");
		Moyentopping.setBounds(17, 40, 85, 16);
		ToppingPrice.add(Moyentopping);

		JLabel Largetopping = new JLabel("Large: 1.60$");
		Largetopping.setBounds(17, 59, 85, 16);
		ToppingPrice.add(Largetopping);

		JLabel ExtraLargetopping = new JLabel("Extra Large: 1.80$");
		ExtraLargetopping.setBounds(17, 78, 127, 16);
		ToppingPrice.add(ExtraLargetopping);

		JLabel Fetetopping = new JLabel("Fete: 2.30$");
		Fetetopping.setBounds(17, 97, 93, 16);
		ToppingPrice.add(Fetetopping);

		JPanel BreuvagePrice = new JPanel();
		BreuvagePrice.setBackground(new Color(255, 147, 0));
		BreuvagePrice.setLayout(null);
		BreuvagePrice.setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null), "Breuvages", TitledBorder.LEADING, TitledBorder.TOP, null, new Color(0, 0, 0)));
		Menu.add(BreuvagePrice);

		JLabel Pop = new JLabel("Pop: 1.10$");
		Pop.setBounds(17, 21, 72, 16);
		BreuvagePrice.add(Pop);

		JLabel Jus = new JLabel("Jus: 1.35$");
		Jus.setBounds(17, 40, 85, 16);
		BreuvagePrice.add(Jus);

		JLabel Eau = new JLabel("Eau: 1.00$");
		Eau.setBounds(17, 59, 85, 16);
		BreuvagePrice.add(Eau);

		JPanel PizzaSelect = new JPanel();
		PizzaSelect.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
		PizzaSelect.setBackground(new Color(255, 147, 0));
		PizzaSelect.setBounds(16, 187, 350, 300);
		contentPane.add(PizzaSelect);
		PizzaSelect.setLayout(null);
		
		JComboBox ChoixPizza = new JComboBox(new String[] {"Small", "Medium", "Large", "Extra Large", "Party Square"});
		ChoixPizza.setMaximumRowCount(5);
		ChoixPizza.setBounds(122, 90, 130, 27);
		PizzaSelect.add(ChoixPizza);

		JLabel NombrePizzaTitle = new JLabel("Choix Pizza");
		NombrePizzaTitle.setForeground(new Color(0, 252, 255));
		NombrePizzaTitle.setFont(new Font("Hiragino Sans GB", Font.BOLD, 15));
		NombrePizzaTitle.setBounds(139, 6, 90, 27);
		PizzaSelect.add(NombrePizzaTitle);


		NumPizza = new JTextField();
		NumPizza.setBounds(122, 129, 130, 26);
		PizzaSelect.add(NumPizza);
		NumPizza.setColumns(10);

		JLabel PizzaIcon = new JLabel("");
		PizzaIcon.setBounds(6, 6, 350, 279);
		PizzaSelect.add(PizzaIcon);
		PizzaIcon.setIcon(new ImageIcon(PizzaOrder.class.getResource("/Image/PizzaImage.png")));

		JPanel ToppingSelect;
		ToppingSelect = new JPanel();
		ToppingSelect.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
		ToppingSelect.setBackground(new Color(255, 147, 0));
		ToppingSelect.setBounds(400, 187, 208, 129);
		contentPane.add(ToppingSelect);
		ToppingSelect.setLayout(null);;

		JLabel NombreToppingTitle = new JLabel("Nombre de topping");
		NombreToppingTitle.setForeground(new Color(0, 252, 255));
		NombreToppingTitle.setFont(new Font("Hiragino Sans GB", Font.BOLD, 15));
		NombreToppingTitle.setBounds(29, 23, 150, 27);
		ToppingSelect.add(NombreToppingTitle);

		NumTopping = new JTextField();
		NumTopping.setBounds(39, 50, 130, 26);
		NumTopping.setColumns(10);
		ToppingSelect.add(NumTopping);

		JLabel ToppingIcon = new JLabel("");
		ToppingIcon.setIcon(new ImageIcon(PizzaOrder.class.getResource("/Image/ToppingImage.png")));
		ToppingIcon.setBounds(6, 8, 208, 109);
		ToppingSelect.add(ToppingIcon);

		JPanel BreuvageSelect = new JPanel();
		BreuvageSelect.setBorder(new SoftBevelBorder(BevelBorder.LOWERED, null, null, null, null));
		BreuvageSelect.setBackground(new Color(255, 147, 0));
		BreuvageSelect.setBounds(400, 358, 208, 129);
		contentPane.add(BreuvageSelect);
		BreuvageSelect.setLayout(null);;

		JLabel NombreToppingTitle_1 = new JLabel("Choix de breuvages");
		NombreToppingTitle_1.setBounds(34, 6, 150, 27);
		BreuvageSelect.add(NombreToppingTitle_1);
		NombreToppingTitle_1.setForeground(new Color(0, 252, 255));
		NombreToppingTitle_1.setFont(new Font("Hiragino Sans GB", Font.BOLD, 15));

		NumBreuvage = new JTextField();
		NumBreuvage.setBounds(47, 62, 130, 26);
		NumBreuvage.setColumns(10);
		BreuvageSelect.add(NumBreuvage);

		JLabel BreuvageIcon = new JLabel("");
		BreuvageIcon.setIcon(new ImageIcon(PizzaOrder.class.getResource("/Image/BreuvageImage.png")));
		BreuvageIcon.setBounds(0, 0, 209, 129);
		BreuvageSelect.add(BreuvageIcon);
		
		JComboBox ChoixBreuvage = new JComboBox(new String[] {"Pop", "Jus", "Eau"});
		ChoixBreuvage.setMaximumRowCount(3);
		ChoixBreuvage.setBounds(47, 36, 130, 27);
		BreuvageSelect.add(ChoixBreuvage);


		JButton Quitter = new JButton("Quitter");
		Quitter.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
		Quitter.setBounds(33, 552, 160, 50);
		contentPane.add(Quitter);


		Ajouter = new JButton("Ajouter");
		Ajouter.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
			
			}
			});
		Ajouter.setBounds(234, 552, 160, 50);
		contentPane.add(Ajouter);




		JButton Payer = new JButton("Payer");
		Payer.setBounds(431, 552, 160, 50);
		contentPane.add(Payer);
		Payer.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
			Receipt receipt = new Receipt();
			receipt.setVisible(true);
			dispose();
			}
			});
		setVisible(false);
	}
}