Book Store

Book Store

import java.util.*;

class Book {
  private String bookTitle;
  private String bookAuthor;
  private String bookISBN;
  private int bookCopies;

  Book() {
    this("null", "null", "null", 0);
  }

  Book(String bookTitle, String bookAuthor, String bookISBN, int bookCopies) {
    this.bookTitle = bookTitle;
    this.bookAuthor = bookAuthor;
    this.bookISBN = bookISBN;
    this.bookCopies = bookCopies;
  }

  public String getBookTitle() {
    return bookTitle;
  }

  public void setBookTitle(String bookTitle) {
    this.bookTitle = bookTitle;
  }

  public String getBookAuthor() {
    return bookAuthor;
  }

  public void setBookAuthor(String bookAuthor) {
    this.bookAuthor = bookAuthor;
  }

  public String getBookISBN() {
    return bookISBN;
  }

  public void setBookISBN(String bookISBN) {
    this.bookISBN = bookISBN;
  }

  public int getBookCopies() {
    return bookCopies;
  }

  public void setBookCopies(int bookCopies) {
    this.bookCopies = bookCopies;
  }

  public void display() {
    System.out.println("Book title: " + getBookTitle());
    System.out.println("Book Author: " + getBookAuthor());
    System.out.println("Book ISBN value: " + getBookISBN());
    System.out.println("Number of Copies : " + getBookCopies());
  }
}

class BooksStore {
	//max no. of books are 10;
  private Book[] books = new Book[10];

  // -----------------------------------------------------------------------------------------------------

  public void sell(String Title, int copies) {
    for (int i = 0; i <= books.length; i++) {
      if (books[i] != null && books[i].getBookTitle().equals(Title)) {
        if(books[i].getBookCopies() >= copies)
          books[i].setBookCopies(books[i].getBookCopies() - copies);
        else{
          System.err.println("No. of copies are more than present");
          return;
        }
        return;
      } else {
        System.out.println("\n\nBook Not Found!!");
        break;
      }
    }
  }

  // -------------------------------------------------------------------------------------

  public void order(String ISBN, int Copies) {
    boolean found = false;
    int i;
    for (i = 0; i < books.length; i++) {
      if (books[i] != null && books[i].getBookISBN().equals(ISBN)) {
        books[i].setBookCopies(books[i].getBookCopies() + Copies);
        // display();
        found = true;
        break;
      }
      else if(books[i] == null){
        Scanner scanner = new Scanner(System.in);
        System.out.println("\n Enter Book Title - ");
        String Title = scanner.next();

        System.out.println("\n Enter Author's Name - ");
        String Author = scanner.next();

        System.out.println("\n Enter ISBN value -");
        String ISBN1 = scanner.next();

        System.out.println("\n Enter Number of Copies - ");
        int Copies1 = scanner.nextInt();
        books[i] = new Book(Title, Author, ISBN1, Copies1);
        break;
      }
      if(i == books.length) System.err.println("No books to be added");
    }
  }

  // --------------------------------------------------------------------------------------------

  public void display() {
    if(books[0] == null){
        System.err.println("NO books found");
        return;
      } 
    for (int j = 0; j < books.length; j++) {
      if(books[j] != null) books[j].display(); 
    }
  }
}

public class BookStoreApp {
  public static void main(String[] args) {
    BooksStore book = new BooksStore();
    //book.initialize();
    String choice2;
    Scanner scanner = new Scanner(System.in);
    do {
      System.out.println("\nEnter Option: \n" + " Press 1: To Display all the Books \n"
          + "Press 2: To Order more Books\n " + " Press 3 : To Sell Books \n");
      int choice = scanner.nextInt();
      switch (choice) {
      case 1:
        book.display();
        break;
      case 2:
        book.order("abc", 100);
        break;
      case 3:
        System.out.println("\nEnter the Book Title: ");
        String title = scanner.next();
        System.out.println("\nEnter the no. of copies: ");
        int copies = scanner.nextInt();
        book.sell(title, copies);
        System.out.println("\n\nThank You! Please do Visit us Again... ");
        break;
      case 4:
        System.exit(0);
        break;
      default:
        System.out.println("\n ---------------- Enter a valid option -----------------");
      }
      System.out.println("\n\nWant to continue ??\n Press 'Y' to continue");
      choice2 = scanner.next();
    } while (choice2.equals("y"));
    scanner.close();
  }
}