BookStoreApp

package com.company;
//package bookstoreapp;

public class Book {
    String bookTitle;
    String Author;
    String ISBN;
    int numOfCopies;

    public Book(String bookTitle,String Author,String ISBN,int numOfCopies){

        this.bookTitle = bookTitle;
        this.Author = Author;
        this.ISBN = ISBN;
        this.numOfCopies = numOfCopies;
    }
    public void display(){
        System.out.println("Book Tilte : "+bookTitle);
        System.out.println("Auhtor : "+Author);
        System.out.println("ISBN: "+ISBN);
        System.out.println("Quantity : "+numOfCopies);
    }
}

package com.company;

//package bookstoreapp;

        import javax.swing.JOptionPane;

public class BookStore {

    Book[] books = new Book[10];

    {
        books[0] = new Book("Java","Herbert Schieldt","5500",10);
        books[1] = new Book("ANSII C","Balagurusami","6541",5);
        books[2] = new Book("Assembly Language","Alister Cook","1245",15);
    }

    public boolean sell(String bookTitle, int numOfCopies) {

        if (books == null) {
            System.out.println("Book is not found in the store");
            return false;
        }
        for (int i = 0; i < books.length; i++) {

            if (books[i] != null) {
                if (books[i].bookTitle.equals(bookTitle)) {
                    if (books[i].numOfCopies < numOfCopies) {
                        System.out.println("Not enough book is available in the store");
                    } else {
                        books[i].numOfCopies = books[i].numOfCopies - numOfCopies;
                        JOptionPane.showMessageDialog(null,"Your book has been sold");
                    }

                    return true;
                }
            }

        }
        System.out.println("Book is not found in the store");
        return false;

    }

    public void order(String ISBN, int numOfCopies) {

        int totalValidNumber = 0;
        for (int i = 0; i < books.length; i++) {
            if (books[i] != null) {
                if (books[i].ISBN.equals(ISBN)) {
                    books[i].numOfCopies = books[i].numOfCopies + numOfCopies;
                    return;
                }
                totalValidNumber = i + 1;
            }

        }

        System.out.println(totalValidNumber);
        if (totalValidNumber < 10) {
            String bookName = null;
            String bookAuthor = null;
            bookName = JOptionPane.showInputDialog(null, "Enter Book Name:  ");
            bookAuthor = JOptionPane.showInputDialog(null, "Enter Author Name:  ");
            books[totalValidNumber] = new Book(bookName, bookAuthor,ISBN, numOfCopies);
        }

    }

    public void display() {

        for (int i = 0; i < books.length; i++) {
            if (books[i] != null) {

                books[i].display();
            }

        }

    }
}



package com.company;
import java.util.Scanner;

class BookStoreApp {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);


        BookStore books = new BookStore();

        System.out.println("\n---------- Welcome to your Book Store App ----------\n\n");

        while (true) {

            System.out.println("Enter <1> for Displaying all books.");
            System.out.println("Enter <2> to order a new book.");
            System.out.println("Enter <3> for selling a book.");
            System.out.println("Enter <4> for Exiting Out.\n\n");
            System.out.printf("Enter your choice: ");

            int choice;
            choice = scan.nextInt();

            String nameOrIsbn;
            int nums;

            switch (choice)
            {
                case 1:
                    books.display(); break;
                case 2:
                    System.out.printf("Enter Book's ISBN: ");  nameOrIsbn = scan.next();
                    System.out.printf("How many? ");  nums = scan.nextInt();
                    books.order(nameOrIsbn, nums);
                    break;
                case 3:
                    System.out.printf("Enter Book's Name: ");  nameOrIsbn = scan.next();
                    System.out.printf("How many? ");  nums = scan.nextInt();
                    books.sell(nameOrIsbn, nums);
                    break;
                case 4:
                    System.out.println("Bye Bye!\nSee you later!");  scan.close();
                    System.exit(1);
                    break;

                default:
                    System.out.println("Only numbers between 1 and 4 (inclusive) are accepted.\n\n");
            }
        }

    }