Question

1. WHEN I RUN THE CODE AT FIRST AND I SELECT THE RETURN OPTION, IT BREAKS. BUT WHEN I SELCT THE RETURN OPTION AFTER I BORROW A BOOK, IT WORKS

2. WHY IS MY ARRAYLIST NO SAVING? WHAT I MEAN IS THAT AFTER I BORROW A BOOK AND I END THE SYSTEM, WHEN I RESTART IT, THE BOOK I BORROWED IS STILL AVAILABLE

3.ALSO ANY IDEAS ON WHAT MY TEST CASES COULD BE?

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package librarysystem;

import java.util.ArrayList;

import java.util.Scanner;

/**

*

*/

public class Books {

ArrayList<String> availBooks = new ArrayList<>();

ArrayList<String> borrowedBooks = new ArrayList<>();

ArrayList<String> allBooks = new ArrayList<>();

Scanner input = new Scanner(System.in);

Books() {

}

public void availableBooks() {

availBooks.add("Chronicle of Narnia");

availBooks.add("Harry Potter");

availBooks.add("The fault in our stars");

availBooks.add("Wizard of Oz");

}

public void allBooks() {

allBooks.add("Chronicle of Narnia");

allBooks.add("Harry Potter");

allBooks.add("The fault in our stars");

allBooks.add("Wizard of Oz");

allBooks.add("James Bond");

allBooks.add("The Hobbit");

allBooks.add("Fellowship of the ring");

}

public void borrowedBooks() {

borrowedBooks.add("James Bond");

borrowedBooks.add("The Hobbit");

borrowedBooks.add("Fellowship of the ring");

}

public void begin() {

System.out.println(".............................");

System.out.println("What would you like to do today?");

System.out.println("1. Search for book"

+ "\n" + "2. Borrow book" + "\n" + "3. Return book"

+ "\n" + "4. Log out" + "\n pick 1,2,3 or 4");

int ans = input.nextInt();

input.nextLine();

if (ans == 1) {

searchBooks();

} else if (ans == 2) {

borrow();

} else if (ans == 3) {

returnBook();

} else if (ans == 4) {

System.out.println("Logging out...");

System.exit(0);

} else {

System.out.println("Pleasepick 1,2,3 or 4");

}

}

public void searchBooks() {

System.out.println("What is the name of the book youre looking for?");

String bookName = input.nextLine();

if (allBooks.contains(bookName) && borrowedBooks.contains(bookName)) {

System.out.println("Book found!: " + bookName);

System.out.println("Status: Unavailble for borrowing");

System.out.println("returning to main session ...");

begin();

} else if (allBooks.contains(bookName)

&& availBooks.contains(bookName)) {

System.out.println("Book found!: " + bookName);

System.out.println("Status: Available for borrowing");

System.out.println("Would you like to borrow" + bookName

+ "? yes or no");

String ans = input.nextLine();

if (ans.equalsIgnoreCase("yes")) {

borrow1(bookName);

} else if (ans.equalsIgnoreCase("no")) {

System.out.println("returning to main session ...");

begin();

} else {

System.out.println("returning to main session ...");

}

} else {

System.out.println("Sorry, we could not find " + bookName);

System.out.println("returning to main session ...");

begin();

}

}

public void borrow() {

System.out.println("What is the name of the book you"

+ " would like to borrow?");

String borrowName = input.nextLine();

if (allBooks.contains(borrowName)

&& borrowedBooks.contains(borrowName)) {

System.out.println("Book found!: " + borrowName);

System.out.println("Status: Unavailble for borrowing");

System.out.println("returning to main session ...");

begin();

} else if (allBooks.contains(borrowName)

&& availBooks.contains(borrowName)) {

System.out.println("Book found!: " + borrowName);

System.out.println("Status: Available for borrowing");

System.out.println("Would you like to borrow " + borrowName

+ "? yes or no");

String ans = input.nextLine();

if (ans.equalsIgnoreCase("Yes")) {

borrow1(borrowName);

} else if (ans.equalsIgnoreCase("No")) {

System.out.println("returning to main session ...");

begin();

} else {

System.out.println("returning to main session ...");

}

} else {

System.out.println("Sorry, we could not find " + borrowName);

System.out.println("returning to main session ...");

begin();

}

}

public void borrow1(String nameOfBook) {

System.out.println("Borrowing ...");

availBooks.remove(nameOfBook);

borrowedBooks.add(nameOfBook);

System.out.println("You have successfully borrowed " + nameOfBook);

System.out.println("returning to main session ...");

begin();

}

public void returnBook() {

System.out.println("What is the name of the book "

+ "you would like to return?");

String returnName = input.next();

if (allBooks.contains(returnName)) {

availBooks.add(returnName);

borrowedBooks.remove(returnName);

System.out.println("Returning ...");

System.out.println("Return successful!");

System.out.println("returning to main session ...");

begin();

} else {

System.out.println("This book does not belong to this Library");

System.out.println("returning to main session ...");

begin();

}

}

}

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package librarysystem;

import java.util.ArrayList;

import java.util.Scanner;

import java.util.Arrays;

import java.util.List;

/**

*

*/

public class Users {

Books book = new Books();

ArrayList<String> rUsers = new ArrayList<>();

Scanner input = new Scanner(System.in);

Users() {

}

public void arrayList() {

rUsers.add("name1");

rUsers.add("name2");

}

public void createAccount() {

System.out.println("To register, please enter your Full name");

String fullname = input.nextLine();

rUsers.add(fullname);

System.out.println("You have succesfully registered!");

book.allBooks();

book.availableBooks();

book.borrowedBooks();

//CALL THE METHOD THAT STARTS THE OPTIONS

book.begin();

}

public void logIn() {

System.out.println("Please enter your name");

String name = input.nextLine();

if (rUsers.contains(name)) {

System.out.println("You are logged in!");

book.allBooks();

book.availableBooks();

book.borrowedBooks();

book.begin();

} else {

//run the loop that asks the questions

System.out.println("Invalid Login");

System.out.println("Please create account if you are not registered");

createAccount();

}

}

}

/*

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

*/

package librarysystem;

import java.util.Scanner;

/**

*

*/

public class LibrarySystem {

/**

* @param args the command line arguments

*/

public static void main(String[] args) {

Users users = new Users();

Scanner input = new Scanner(System.in);

System.out.println("WELCOME TO LIBRARY SYSTEM");

System.out.println("Are you a registered user? Yes or No");

//asking user if he or she is registered in order to get access into

//the system

String answer = input.nextLine();

// the answer the user types in

if (answer.equalsIgnoreCase("Yes")) {

//if the user is part of the system log in

users.arrayList();

users.logIn();

} else {

users.createAccount();

users.logIn();

}

}

}

Answer 1

Hi,

1) There is only one change in your returnBook() function.you should use nextLine() instead of next() to read string line.

public void returnBook() {
        
System.out.println("What is the name of the book "
+ "you would like to return?");

 String returnName = input.nextLine(); // you were using next() instead nextLine() for string line
 if (allBooks.contains(returnName)) { 
        
availBooks.add(returnName);
borrowedBooks.remove(returnName);
System.out.println("Returning ...");
System.out.println("Return successful!");
System.out.println("returning to main session ...");
begin();
} else {
System.out.println("This book does not belong to this Library");
System.out.println("returning to main session ...");
begin();
}
}

2) WHY IS MY ARRAYLIST NO SAVING? WHAT I MEAN IS THAT AFTER I BORROW A BOOK AND I END THE SYSTEM, WHEN I RESTART IT, THE BOOK I BORROWED IS STILL AVAILABLE.

When you end the system means exit the system after pressing option 4 then you will be exit from the program and everything will be lost from memory..you are not saving your data in the database but in arraylist which is temprary data structure to hold the data.

3) ALSO ANY IDEAS ON WHAT MY TEST CASES COULD BE?

A TEST CASE is a set of actions executed to verify a particular feature or functionality of your software application.

For test cases: suppose you are writing test case for registration part then

First, check result, registraion details if user is entering correct details

Second, check result if user is entering any invalid entry

Third, check result if user is inputing empty string

This is nothing but a test case for the user registration.you can write then same test cases for Login, Search book, borrow book and return books.

Feel free to ask if any question you have by comment box?

Thanks