/* Cashier class Anderson, Franceschi */

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JOptionPane; import java.text.DecimalFormat;

public class Cashier extends JFrame { private Cart cart; private Item previousItem; private double currentTotal;

public Cashier() { super("Chapter 6 Programming Activity 2"); cart = new Cart(); previousItem = null; currentTotal = 0.0; getContentPane().setBackground(cart.getBackground()); setSize(325, 300); setVisible(true); }

public void checkout(int numberOfItems) { /* ***** Student writes the body of this method ***** */ // // The parameter of this method, numberOfItems, // represents the number of items in the cart. The // user will be prompted for this number. // // Using a for loop, calculate the total price // of the groceries for the cart. // // The getNext method (in this Cashier class) returns the next // item in the cart, which is an Item object (we do not // know which item will be returned; this is randomly generated). // getNext does not take any arguments. its API is // Item getNext() // // As the last statement of the body of your for loop, // you should call the animate method. // The animate method takes one parameter: a double, // which is your current subtotal. // For example, if the name of your variable representing // the current subtotal is total, your call to the animate // method should be: // animate(total); // // The getPrice method of the Item class // returns the price of the Item object as a double. // The getPrice method does not take any arguments. Its API is // double getPrice() // // After you have processed all the items, display the total // for the cart in a dialog box. // Student code starts here:

// Student code ends here. }

public Item getNext() { if (cart.getTotalNumberItems() > cart.getNumberItems()) { // get next item cart.setCurrentItem ((int) (Math.random() * cart.getItemSize()));

// update previousItem so that we can keep track of the current total previousItem = cart.getItems()[cart.getCurrentItem()];

// update number of items in cart cart.updateNumberItems();

// update currentTotal if ((previousItem != null) && (previousItem.getPrice() >= 0)) currentTotal += previousItem.getPrice(); cart.setExactTotal(currentTotal);

return (cart.getItems())[cart.getCurrentItem()]; } else { JOptionPane.showMessageDialog(null, "Error: getNext() method called when cart is empty", "Logic error", JOptionPane.ERROR_MESSAGE); return null; } }

public void animate(double subtotal) { cart.updateTotal(subtotal);

repaint(); try { Thread.sleep(3000); // wait for the animation to finish } catch (Exception e) { } }

public void paint(Graphics g) { super.paint(g); cart.draw(g); }

public static void main(String [] args) { Cashier app = new Cashier(); app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); int numItems = 0; boolean goodInput = false; do { String howMany = JOptionPane.showInputDialog(null, "Enter the number of items in the cart (1 - 10)"); if (howMany == null) System.exit(0); try { numItems = Integer.parseInt(howMany); goodInput = true; } catch(NumberFormatException nfe) { // goodInput is still false } } while (!goodInput || numItems < 1 || numItems > 10);

(app.cart).updateTotalNumberItems(numItems); app.checkout(numItems); }

}