Please help me with my assignment

[Shin]

hi im new at java. my professor told us to make an ordering system, so i got myself stuck when im now on the transaction code, here's my code,

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Cofee extends JFrame implements ActionListener, ItemListener {
   double x,y,totalamount;

    JPanel p1 = new JPanel();
    JPanel p2 = new JPanel();
    JPanel p3 = new JPanel();


    JLabel lblCoffee = new JLabel("COFFEE");
    JLabel lblPastry = new JLabel("PASTRY");

    JLabel lblcof = new JLabel("Total:      P");
    JLabel lblpas = new JLabel("Total:      P");

    JTextField txttall = new JTextField(3);
    JTextField txtventi = new JTextField(3);
    JTextField txtgrande = new JTextField(3);

    JCheckBox chk1 = new JCheckBox("Tall");
    JCheckBox chk2 = new JCheckBox("Venti");
    JCheckBox chk3 = new JCheckBox("Grande");

    JTextField txtcake = new JTextField(3);
    JTextField txtbread = new JTextField(3);
    JTextField txtpie = new JTextField(3);

    JCheckBox chk4 = new JCheckBox("Cake");
    JCheckBox chk5 = new JCheckBox("Bread");
    JCheckBox chk6 = new JCheckBox("Pie");

    JLabel total = new JLabel("TOTAL AMOUNT           P ");
    JLabel recieve = new JLabel("AMOUNT RECIEVED     P ");
    JLabel change = new JLabel("CHANGE                         P ");

    JTextField txtamount = new JTextField(10);
    JTextField txtar = new JTextField(10);
    JTextField txtch = new JTextField(10);

    JButton btnCompute = new JButton("COMPUTE");
    JButton btnPurchase = new JButton("PURCHASE");
    JButton btnClose = new JButton("CLOSE");

    JLabel pa1 = new JLabel(" ");
    JLabel pa2 = new JLabel(" ");
    int numcf1;
    int numcf2;
    int numcf3;

    int numpt1;
    int numpt2;
    int numpt3;

    int optchoice;
    final int tall = 170;
    final int venti = 180;
    final int grande = 200;
    final int cake = 100;
    final int bread = 120;
    final int pie = 140;

    double talltotal = numcf1 * tall;
    double ventitotal = numcf2 * venti;
    double grandetotal = numcf3 * grande;

    double caketotal = numpt1 * cake;
    double breadtotal = numpt2 * bread;
    double pietotal = numpt3 * pie;
    String s1 = String.valueOf(talltotal);



    public Cofee() {

        super("Coffee Ordering System");

        FlowLayout flow = new FlowLayout();
        setLayout(new FlowLayout(FlowLayout.LEFT, 15, 15));
        setSize(350,380);
        
        add(p1);
        add(p2);
        add(p3);
        p1.setBackground(Color.CYAN);
        p1.setBorder(BorderFactory.createTitledBorder("COFFEE"));
        p1.setLayout(new GridLayout(5,3,1,1));

        
        p1.add(chk1);
        p1.add(txttall);
        p1.add(chk2);
        p1.add(txtventi);
        p1.add(chk3);
        p1.add(txtgrande);
        p1.add(lblcof);
        p1.add(pa1);
        
        p2.setBackground(Color.CYAN);
        p2.setBorder(BorderFactory.createTitledBorder("PASTRY"));
        p2.setLayout(new GridLayout(5,3,1,1));
      
        p2.add(chk4);
        p2.add(txtcake);
        p2.add(chk5);
        p2.add(txtbread);
        p2.add(chk6);
        p2.add(txtpie);
        p2.add(lblpas);
        p2.add(pa2);

      add(total);
      add(txtamount);
      add(recieve);
      add(txtar);
      add(change);
      add(txtch);
      add(btnCompute);
      add(btnPurchase);
      add(btnClose);
        chk1.setSelected(false);
        chk2.setSelected(false);
        chk3.setSelected(false);
        chk4.setSelected(false);
        chk5.setSelected(false);
        chk6.setSelected(false);
       
      chk1.addActionListener(this);
        chk2.addActionListener(this);
        chk3.addActionListener(this);
        chk4.addActionListener(this);
        chk5.addActionListener(this);
        chk6.addActionListener(this);
        btnCompute.addActionListener(this);
        btnPurchase.addActionListener(this);
        btnClose.addActionListener(this);

    }
    public void actionPerformed(ActionEvent e)
    {



       
        



    }
    public void itemStateChanged(ItemEvent e) {

        Object source = e.getItemSelectable();

        
        if (source == chk1) {
            pa1.setText(s1);


    }


    public static void main(String[] args) {
        Cofee display = new Cofee();
        display.setVisible(true);
        display.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        

    }
}

[Junky]

so i got myself stuck when im now on the transaction code

Well that's too bad. Feel free to come back when you have a question.

[Shin]

Well that's too bad. Feel free to come back when you have a question.

my question is when i click the check box. nothing happened,

[Keith Jackson]

Without digging too deep into it, the first thing that jumps out at me is that your actionPerformed method does not contain any code.