This program won\'t run can you fix the errors please? import java.awt.BorderLay

Question

This program won't run can you fix the errors please?

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class ShoppingGui {
   private JFrame frame;
   private JLabel total;
   private JCheckBox discount;
   private ShoppingCart cart;
  

   public ShoppingGui(Catalog catalog) {
       cart = new ShoppingCart();
       createComponents();
       setupEvents();
       performLayout(catalog);
       frame.setVisible(true);
   }
  
   // Constructs all of the graphical components to reside in the window frame
   private void createComponents() {
       // label to display the ORDER TOTAL
       total = new JLabel();
       total.setHorizontalAlignment(SwingConstants.CENTER);
       updateTotal();
      
       // checkbox for applying a bulk discount to the entire shopping cart
       discount = new JCheckBox();
       discount.setText(ShoppingCart.getDiscountPercentage()
               + "% off when you buy "
               + ShoppingCart.getDiscountQuantity()
               + " or more items");
       discount.setSelected(cart.hasDiscount());
       discount.setHorizontalAlignment(SwingConstants.CENTER);

       // window frame for the overall display
       frame = new JFrame("CSE 331 Shopping");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
  
   // Sets up event handlers on all relevant components in the window.
   private void setupEvents() {
       // when the user checks/unchecks the Discount box, inform the shopping cart
       discount.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent arg0) {
               cart.setDiscount(discount.isSelected());
               updateTotal();
           }
       });
   }
  
   // Constructs containers to do the layout and positioning of the components
   // in the window. Also, creates the display components for the catalog items.
   private void performLayout(Catalog catalog) {
       // create a display panel to show each item in the store
       JPanel center = new JPanel(new GridLayout(0, 1));
       center.setBorder(BorderFactory.createTitledBorder(catalog.getStoreName()));
       for (Item item : catalog) {
           center.add(new ItemPanel(item));
       }
      
       // south panel stores the ORDER TOTAL label and discount checkbox
       JPanel south = new JPanel(new GridLayout(0, 1));
       south.add(total);
       south.add(discount);
      
       // frame's content pane stores overall layout for the window
       Container contentPane = frame.getContentPane();
       contentPane.add(center, BorderLayout.CENTER);
       contentPane.add(south, BorderLayout.SOUTH);
       frame.pack();
       center(frame);
   }
  
   // Updates the ORDER TOTAL label's text when a purchase in the window changes.
   private void updateTotal() {
       total.setText(String.format("$%.2f ORDER TOTAL", cart.getTotal()));
   }
  
   // Positions the given window in the center of the screen.
   private static void center(Window window) {
       Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
       window.setLocation((screen.width - window.getWidth()) / 2,
               (screen.height - window.getHeight()) / 2);
   }
  
   /**
   * Represents one-panel container to hold the information about a single item
   * available for purchase in the store, including the graphical components
   * for that item, such as its text box to type in how many to buy and the
   * label to show the item's description.
   */
   private class ItemPanel extends JPanel {
       private static final long serialVersionUID = 0;
      
       private Item item;
       private JTextField textField;
       private JLabel label;
      
       public ItemPanel(Item item) {
           this.item = item;
          
           setLayout(new FlowLayout(FlowLayout.LEFT));
           textField = new JTextField(3);
           textField.setHorizontalAlignment(SwingConstants.CENTER);
           label = new JLabel(item.toString());
           add(textField);
           add(label);
          
           textField.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent event) {
                   update();
               }
           });
          
           textField.addFocusListener(new FocusAdapter() {
               public void focusLost(FocusEvent event) {
                   update();
               }
           });
       }
      
       // Called when the text in this item's text field changes.
       // Informs the shopping cart of the update to the item's purchase quantity.
       private void update() {
           String text = textField.getText().replaceAll("[^0-9-]+", "");
           textField.setText(text);
           int quantity = 0;
           if (!text.isEmpty()) {
               try {
                   quantity = Integer.parseInt(text);
               } catch (NumberFormatException nfe) {
                   System.err.println(nfe);
               }
           }
          
           Purchase purchase = new Purchase(item, quantity);
           cart.add(purchase);
           updateTotal();
          
           if (textField.hasFocus()) {
               textField.transferFocus();
           }
       }
   }
}

Explanation / Answer

There are some classes are missing in the code, like as

add these classes in your code and their methods are also missing,and also add them.

beacuse these classes and methods are missing, that's why it is giving error.

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