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import java.util.Scanner;

class BookStore {

private Book[] b = new Book[10]; int len = 0;

public BookStore() {


b[0] = new Book("Head First Java", "O Railey", "JAVAISBN", 3);
b[1] = new Book("C Programming", "Herbert Schield", "CPRGRM", 4);
b[2] = new Book("Linear Algebra", "Kenith Bleh", "MATH183", 5);

len = 3;

}

public void display() {

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


for (int i = 0; i < 10 && b[i] != null; i++) {

System.out.printf("%d %s\t%s\t%s\t%d\n", i+1, b[i].bookTitle, b[i].author, b[i].ISBN, b[i].numCopies);
}

if (len == 0) System.out.println("There are no books to display."); System.out.println("\n\n");

}

public void order(String isbn, int nums) {

for ( int index = 0; index < len && b[index] != null; index++) {

if (b[index].ISBN.equals(isbn) ) { b[index].numCopies += nums; return;

}
}

Scanner scan = new Scanner(System.in);

System.out.println("New Book Name: ");
String name = scan.nextLine();

System.out.println("New Book's Author: ");
String auth = scan.nextLine()
b[index] = new Book(name, auth, isbn, nums); len++;

}

public void sell(String name, int nums) {
for (int index = 0; index < len && b[index] != null; index++) {

if (b[index].bookTitle.equals(name) ) {

if (b[index].numCopies >= nums) {

b[index].numCopies -= nums;

System.out.printf("You have just sold %d copies of %s\n\n",
nums, name);

System.out.printf("You now have %d of %s left.\n\n", b[index].numCopies, b[index].bookTitle);

return;
}
}
}
System.out.println("The book is not available now... Do check back another time!");
}

}


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");
}
}

}
}