Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question

How do I fix the errors?

Code:

import java.util.Scanner;
public class ReceiptMaker {

public static final String SENTINEL = "checkout";
public final int MAX_NUM_ITEMS;
public final double TAX_RATE;
private String[] itemNames;
private double[] itemPrices;
private int numItemsPurchased;

public ReceiptMaker() {
MAX_NUM_ITEMS = 10;
TAX_RATE = 0.0875;
itemNames = new String[MAX_NUM_ITEMS];
itemPrices = new double[MAX_NUM_ITEMS];
numItemsPurchased = 0;
}
public ReceiptMaker(int maxNumItems, double taxRate) {
MAX_NUM_ITEMS = maxNumItems;
TAX_RATE = taxRate;
itemNames = new String[MAX_NUM_ITEMS];
itemPrices = new double[MAX_NUM_ITEMS];
numItemsPurchased = 0;
}

public void greetUser() {
System.out.println("Welcome to the " + MAX_NUM_ITEMS + " items or less checkout line");
}
public void promptUserForProductEntry() {
System.out.println("Enter item #" + (numItemsPurchased + 1) + "'s name and price separated by a space, or enter \"checkout\" to end transaction early");
}
public void addNextPurchaseItemFromUser(String itemName, double itemPrice) {
itemNames[numItemsPurchased] = itemName;
itemPrices[numItemsPurchased] = itemPrice;
numItemsPurchased++;
}
public double getSubtotal() {
double subTotal = 0;
for (int i = 0; i < numItemsPurchased; i++) {
subTotal += itemPrices[i];
}
return subTotal;
}
public double getMinPrice() {
double minPrice = itemPrices[0];
for (int i = 1; i < numItemsPurchased; i++) {
if (itemPrices[i] < minPrice) {
minPrice = itemPrices[i];
}
}
return minPrice;
}
public int getIndexOfMinPrice() {
int indexOfMin = 0;
for (int i = 1; i < numItemsPurchased; i++) {
if (itemPrices[i] < itemPrices[indexOfMin]) {
indexOfMin = i;
}
}
return indexOfMin;
}
public double getMaxPrice() {
double maxPrice = (numItemsPurchased > 0) ? Integer.MIN_VALUE : 0;
for (int i = 0; i < numItemsPurchased; i++) {
if (itemPrices[i] > maxPrice) {
maxPrice = itemPrices[i];
}
}
return maxPrice;
}
public int getIndexOfMaxPrice() {
int indexOfMax = 0;
for (int i = 1; i < numItemsPurchased; i++) {
if (itemPrices[i] > itemPrices[indexOfMax]) {
indexOfMax = i;
}
}
return indexOfMax;
}
public double getMeanPrice() {
if (numItemsPurchased > 0) {
return getSubtotal() / numItemsPurchased;
}
return 0;
}

public double getTaxOnSubtotal() {
return getSubtotal() * TAX_RATE;
}

public double getTotal() {
return getSubtotal() + getTaxOnSubtotal();
}

public void displayReceipt() {
System.out.println("-------------------------------------------------");
System.out.printf("Subtotal: $ %04.2f | # of Items %02d\n", getSubtotal(), numItemsPurchased);
System.out.printf(" Tax: $ %05.2f \n", getTaxOnSubtotal());
System.out.printf(" Total: $ %04.2f \n", getTotal());
System.out.println("--------------------THANK YOU--------------------");
}

public void displayReceiptStats() {
System.out.println("\n-----------------RECEIPT STATS-----------------");
System.out.printf("Min Item Name: %10s | Price: $ %04.2f\n", itemNames[getIndexOfMinPrice()], getMinPrice());
System.out.printf("Max Item Name: %10s | Price: $ %04.2f\n", itemNames[getIndexOfMaxPrice()], getMaxPrice());
System.out.printf("Mean price of %02d items purchased: $ %04.2f\n\n", numItemsPurchased, getMeanPrice());
}
public void displayAllItemsWithPrices() {
System.out.println("\n---------------RECEIPT BREAKDOWN---------------");
for (int i = 0; i < numItemsPurchased; i++) {
System.out.printf("Item #%02d Name: %10s | Price: $ %04.2f\n", (i + 1), itemNames[i], itemPrices[i]);
}
}
private double getItemPriceFromUser(Scanner scanner) {
double price = -1;
while ((price = scanner.nextDouble()) < 0) {
System.out.println("Price \"" + price + "\" cannot be negative.\nReenter price");
}
return price;

}

public void scanCartItems(Scanner scanner) {

while (numItemsPurchased < MAX_NUM_ITEMS) {
promptUserForProductEntry();
String token1;
double token2 = -1;
if (!(token1 = scanner.next()).equalsIgnoreCase(SENTINEL)) {
token2 = getItemPriceFromUser(scanner);
addNextPurchaseItemFromUser(token1, token2);
} else {
break;
}
}
}

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
ReceiptMaker rm = new ReceiptMaker();
rm.greetUser();
rm.scanCartItems(scanner);
rm.displayReceipt();
rm.displayReceiptStats();
rm.displayAllItemsWithPrices();
scanner.close();

}
}

Errors:

-java:17: error: cannot access Movie Movie m = null;

-java:15: error: cannot access Movie Movie m = null;

-java:29: error: cannot access Movie Movie m1 = null;

-java:26: error: cannot access Movie Movie m1 = null;

-java:16: error: cannot access Movie field = Movie.class.getDeclaredField(str);

- java:13: error: cannot access Movie constructor = Movie.class.getConstructor();

-java:13: error: cannot access Movie constructor = Movie.class.getConstructor(String.class, int.class, boolean.class,

String[].class);

- java:12: error: cannot access Movie Method methodGetNumMinutes = Movie.class.getMethod("getNumMinutes");

-java:12: error: cannot access Movie Method methodSetNumMinutes = Movie.class.getMethod("setNumMinutes", int.class);

- java:12: error: cannot access Movie Method replaceCastMember = Movie.class.getMethod("replaceCastMember", int.class, String.class);

Expert Solution
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