BlueJ Project on Library Management

This project is on library management. Books are issued to students from library. Details of the students like Name of the student, class in which he/she reads, Regd. No, section, issue and return date of the book are kept in record along with the book name, author of the book and price of the book.

For delay of returning the book, a fine is imposed on students according to the following:

First 7 days: Fine 0

 Next 8 days: Fine Rs. 2 per day

 Next 15 days: Fine Rs. 3.50 per day

 Above 30 days: Rs. 5.50 per day + price of the book

The program deals with the above library management.

Program

import java.io.*;

class Library

{

 String name, regd_no,cl,sec,book,author,issue,ret;

 double fine,price;

 int datediff;

 String s1,s2;

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

 public void take() throws IOException

 {

  System.out.println("Enter Student Name:");

  name=br.readLine();

  System.out.println("Enter Student Regd. No:");

  regd_no=br.readLine();

  System.out.println("Enter Class:");

  cl=br.readLine();

  System.out.println("Enter Section:");

  sec=br.readLine();

  System.out.println("Enter Name of the Book issue:");

  book=br.readLine();

  System.out.println("Enter Author Name of the Book:");

  author=br.readLine();

  System.out.println("Enter Date of Issue of the Book (dd/mm/yyyy):");

  issue=br.readLine();

  System.out.println("Enter Date of Return of the Book (dd/mm/yyyy):");

  ret=br.readLine();

  s1=issue;

  s2=ret;

  diff();

  }

  private void diff()

  {

   int d,d1,m,m1,y,y1;

   d1=0;

   d=0;

   m1=0;m=0;

   int i,x=0;

   datediff=0;

   while(true)

   {

    i=issue.indexOf("/");

    if (i<0)<0 o:p="">

    break;

    if(x==0)

    {

     d=Integer.parseInt(issue.substring(0,i));

     issue=issue.substring(i+1);

     }

    else if(x==1)

    {

     m=Integer.parseInt(issue.substring(0,i));

     issue=issue.substring(i+1);

     }

    x++;

    }

    y=Integer.parseInt(issue);

    x=0;

   while(true)

   {

    i=ret.indexOf("/");

    if (i< 0)<0 o:p="">

    break;

    if(x==0)

    {

     d1=Integer.parseInt(ret.substring(0,i));

     ret=ret.substring(i+1);

     }

    else if(x==1)

    {

     m1=Integer.parseInt(ret.substring(0,i));

     ret=ret.substring(i+1);

     }

    x++;

    }

    y1=Integer.parseInt(ret);

   m1=m1+(12*(y1-y));

   if(m1-m>2)

   datediff=31;

   // date diff is more than 30

   else if(m1-m>1)

   datediff=d1+30-d;

   else

   datediff=d1-d;

   fine();

   }

   private void fine()

   {

    if(datediff<=7)

    fine=0;

    else if(datediff<=15)

    fine=2*datediff;

    else if(datediff<=30)

    fine=3.5*datediff;

    else

    fine=fine+5.5*datediff;

    show();

    }

 private void show()

 {

  System.out.println("Name of the student:"+name);

  System.out.println("Regd No of the student:"+regd_no);

  System.out.println("Class of the student:"+cl);

  System.out.println("Section of the student:"+sec);

  System.out.println("Book issue to the student:"+book);

  System.out.println("Author of the Book:"+author);

  System.out.println("Book issue on:"+s1);

  System.out.println("Return Date of the Book:"+s2);

  System.out.println("Fine Amount:"+fine);

  }

    }

   

Variable Description

Variable Name	Type	Purpose
name	String	Holds name of the student
regd_no	String	Holds Regd No of the student
cl	String	Holds class of the student
sec	String	Holds section of the student
book	String	Holds name of the book
author	String	Holds author’s name of the book
issue	String	Holds issue date of the book in dd/mm/yyyy format
ret	String	Holds return date of the book in dd/mm/yyyy format
fine	double	Holds fine amount
price	double	Holds price of the book
datediff	int	Difference of days between issue and return date of book
s1	String	Holds issue date of the book in dd/mm/yyyy format
s2	String	Holds return date of the book in dd/mm/yyyy format
d	int	Holds the issue date only
d1	int	Holds the return date only
m	int	Holds the issue month no only
m1	int	Holds the return month only
y	int	Holds the issue year
y1	int	Holds the return year