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  1. PO
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    <p>I have done something with your code have look</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.text.*; import javax.swing.*; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class PizzaOrder extends JFrame implements ActionListener, KeyListener, ListSelectionListener { double smallPizzaPrice = 7.00, mediumPizzaPrice = 9.00, largePizzaPrice = 11.00; double sausage = 1.00, ham = 1.00, pineapple = 1.00, mushroom = 1.00, pepperoni = 1.00; JLabel lab1, lab2, lab3, toppers, lab4, lab5; Button button; JTextField text1, text2; ButtonGroup group; JRadioButton small, medium, large; JCheckBox chk1, chk2, chk3, chk4, chk5; JScrollPane jScrollPane1 = new javax.swing.JScrollPane(); JList jList1 = new javax.swing.JList(); DefaultListModel modellist=new DefaultListModel(); PizzaOrder() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); getContentPane().setLayout(null); lab1 = new JLabel("Name: "); lab2 = new JLabel("Quantity: "); lab3 = new JLabel("How hungry are you?"); lab3.setForeground(Color.BLUE); lab3.setFont(new Font("Arial", Font.BOLD, 14)); toppers = new JLabel("Add some toppings : "); toppers.setForeground(new Color(0, 0, 205)); toppers.setFont(new Font("Arial", Font.ITALIC, 14)); lab4 = new JLabel("Total: "); lab4.setForeground(Color.RED); lab4.setFont(new Font("Arial", Font.BOLD, 14)); lab5 = new JLabel("$0.00"); lab5.setForeground(Color.RED); text1 = new JTextField(20); text2 = new JTextField(20); text2.setText(""); small = new JRadioButton("Small", true); medium = new JRadioButton("Medium", false); large = new JRadioButton("Large", false); group = new ButtonGroup(); group.add(small); group.add(medium); group.add(large); chk1 = new JCheckBox("Mushroom", false); chk2 = new JCheckBox("Ham", false); chk3 = new JCheckBox("Pepperoni", false); chk4 = new JCheckBox("Sausage", false); chk5 = new JCheckBox("Pineapple", false); modellist.addElement("Small"); modellist.addElement("Medium"); modellist.addElement("Large"); jList1.setModel(modellist); button = new Button("Order Now"); small.addActionListener(this); medium.addActionListener(this); large.addActionListener(this); chk1.addActionListener(this); chk2.addActionListener(this); chk3.addActionListener(this); chk4.addActionListener(this); chk5.addActionListener(this); text2.addKeyListener(this); button.addActionListener(this); jList1.addListSelectionListener(this); lab1.setBounds(50, 50, 200, 20); lab2.setBounds(50, 90, 200, 20); text1.setBounds(200, 50, 200, 20); text2.setBounds(200, 90, 200, 20); lab3.setBounds(50, 170, 500, 20); small.setBounds(300, 170, 100, 20); medium.setBounds(400, 170, 100, 20); large.setBounds(500, 170, 100, 20); toppers.setBounds(50, 200, 300, 20); chk1.setBounds(50, 230, 200, 20); chk2.setBounds(50, 260, 200, 20); chk3.setBounds(50, 290, 200, 20); chk4.setBounds(50, 320, 200, 20); chk5.setBounds(50, 350, 200, 20); lab4.setBounds(50, 550, 400, 40); lab5.setBounds(200, 550, 500, 40); jScrollPane1.setBounds(300, 270, 200, 300); jScrollPane1.setViewportView(jList1); button.setBounds(50, 600, 100, 20); add(lab1); add(lab2); add(text1); add(text2); add(lab3); add(small); add(medium); add(large); add(toppers); add(chk1); add(chk2); add(chk3); add(chk4); add(chk5); add(lab4); add(lab5); add(button); add(jScrollPane1); text2.selectAll(); setVisible(true); setSize(800, 700); } public void keyTyped(KeyEvent e) { } public void keyPressed(KeyEvent e) { } public void keyReleased(KeyEvent e) { try { Integer.parseInt(text2.getText()); } catch (NumberFormatException fe) { text2.setText(""); } refreshPrice(); } public void actionPerformed(ActionEvent e) { if (e.getSource() == button) { JOptionPane.showMessageDialog(this, "Hi " + text1.getText() + ", thanks for ordering with us!" + "\n\nYour pizza's in the oven. ", "Orders Confirmed", JOptionPane.INFORMATION_MESSAGE); } refreshPrice(); } private void refreshPrice() { double price = 0; int numOfPizzas = Integer.parseInt(text2.getText()); NumberFormat numberForm = NumberFormat.getNumberInstance(); DecimalFormat moneyForm = (DecimalFormat) numberForm; moneyForm.applyPattern("0.00"); if (small.isSelected()) { price += smallPizzaPrice * numOfPizzas; } if (medium.isSelected()) { price += mediumPizzaPrice * numOfPizzas; } if (large.isSelected()) { price += largePizzaPrice * numOfPizzas; } if (chk1.isSelected()) { price += mushroom * numOfPizzas; } if (chk2.isSelected()) { price += sausage * numOfPizzas; } if (chk3.isSelected()) { price += pineapple * numOfPizzas; } if (chk4.isSelected()) { price += pepperoni * numOfPizzas; } if (chk5.isSelected()) { price += ham * numOfPizzas; } lab5.setText("$" + moneyForm.format(price)); } public static void main(String[] args) { @SuppressWarnings("unused") PizzaOrder order = new PizzaOrder(); } @Override public void valueChanged(ListSelectionEvent e) { double price = 0; int numOfPizzas = Integer.parseInt(text2.getText()); NumberFormat numberForm = NumberFormat.getNumberInstance(); DecimalFormat moneyForm = (DecimalFormat) numberForm; moneyForm.applyPattern("0.00"); System.out.println(jList1.getSelectedIndex()); if(jList1.getSelectedIndex()==0) { price += smallPizzaPrice * numOfPizzas; } if(jList1.getSelectedIndex()==1) { price += mediumPizzaPrice * numOfPizzas; } if(jList1.getSelectedIndex()==2) { price += largePizzaPrice * numOfPizzas; } lab5.setText("$" + moneyForm.format(price)); } } </code></pre>
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    1. POHaving trouble understanding JList
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    1. USuser2868431
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    1. COGiven how big the code is, it's best if you point out what the change is, rather than making everyone else hunt and guess.
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      1. USDennis Meng
    2. COOr better yet let the OP read the tutorial and understand the working example and then use the knowledge gained from the tutorial to change the program. `Give a man a fish and he eats for a day. Teach a man to fish and he eats for life`. Spoon feeding code when there are simple eaxamples in the tutorial does not help the OP learn, especially when this is a homeworks question and we should not be writing the code for them, only pointing them in the right direction.
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      1. UScamickr
    3. COthank you for your wisdom
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      1. USuser2868431
 

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