Question

Java Lab Exam Example

You are asked to develop a Library system demo for the librarian. The system should allow the following functions:

1. Check-in Books

a. The system will request users to input the following fields information about books

i. Title

ii. Price

iii. Number of copies to be checked in

b. Notes and hints:

i. There should have no limit of how many books to be checked in at a time.

ii. You can use JOptionPanel or any other methods for retrieving user inputs.

iii. You may use the infinite loop and a break statement to implement this.

2. List books

a. The system will list out all books in the library in a nicely format.

b. Notes and hints:

i. You can use some escape characters for helping formatting the output.

3. Borrow books

a. The system will ask users to input the book’s title for borrow.

b. The system will also ask users to give the number of books to be borrowed.

c. The system will then list the current inventory of all books.

4. Return books

a. As the demo, the system will reuse the title of book from the previous input.

b. The system will only allow one books to be returned at a time.

c. The system will then list the current inventory of all books again for confirming the books are turned successfully.

Answer 1

Two classes are defined for the implementation.

Book.java

Library.java

First, Library.java is:

import java.awt.List;
import java.util.ArrayList;
import java.util.Scanner;

public class LibraryManagement {
   Scanner sc= new Scanner(System.in);
   ArrayList<Book> bookinfo=new ArrayList<Book>();
   String bookNeeded="";
   public void checkInBooks() {
       Book b=new Book();
       System.out.println("Enter the title of book");
       b.setTitle(sc.next());
       System.out.println("Enter the price of book");
       b.setPrice(sc.nextInt());
       System.out.println("Enter the count of book to be checked in");
       b.setCount(sc.nextInt());
       bookinfo.add(b);
   }
   public void listBooks() {
       System.out.println("title price count ");
       for(Book b:bookinfo) {
           System.out.println(b.getTitle()+" "+b.getPrice()+" "+b.getCount());
       }
   }
   public void borrow() {
       System.out.println("Enter the title of book to be borrowed");
       bookNeeded=sc.next();
       System.out.println("Enter the count of books to be borrowed");
       int countNeeded=sc.nextInt();
       for(Book b:bookinfo) {
           {
               if(b.getTitle().equalsIgnoreCase(bookNeeded)) {
                   if(b.getCount()>=countNeeded) {
                       System.out.println("Please collect your books");
                       int newCount=b.getCount()-countNeeded;
                       b.setCount(newCount);
                   }
                   else {
                       System.out.println("Sry, We have less count of required books");
                   }
               }
           }
           System.out.println("Current Inventory is :");
           listBooks();
       }
   }
  
   public void returnBook() {
       for(Book b:bookinfo) {
           if(b.getTitle().equalsIgnoreCase(bookNeeded)) {
           b.setCount(b.getCount()+1);
           }
       }
       System.out.println("After return this book count is :");
       listBooks();
   }

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       LibraryManagement lb=new LibraryManagement();
       lb.checkInBooks();
       lb.listBooks();
       lb.borrow();
       lb.returnBook();

   }

}

Book.java is:

public class Book {
   private String title="";
   private int price=0;
   private int count=0;
   public String getTitle() {
       return title;
   }
   public void setTitle(String title) {
       this.title = title;
   }
   public int getPrice() {
       return price;
   }
   public void setPrice(int price) {
       this.price = price;
   }
   public int getCount() {
       return count;
   }
   public void setCount(int count) {
       this.count = count;
   }
  
  
  

}

output when the Library.java is ran is: