Library Management System Using Switch Statement in Java
Last Updated :
19 Jan, 2024
Here we are supposed to design and implement a simple library management system using a switch statement in Java, where have operated the following operations Add a new book, Check Out a book, display specific book status, search specific book, and display book details using different classes.
Follow the given link to build the Library Management System web application.
Menu for Library Management
Here is the list set of options that we will be creating that are as follows:
Implementation:
We will be creating 5 files including our application(main) class responsible for the execution of our mini-project listed as follows:
- Library
- Students
- Student
- books
- book
Note: As per naming conventions in java, it is good practice to have class initial with uppercase letter still here we are adhering with lowercase for better understanding of the code.
A. File: book.java
Java
// Java Program to Illustrate book Class that
// takes Input from the books and related information
package College;
// Importing required classes
import java.util.Scanner;
// Class
public class book {
// Class data members
public int sNo;
public String bookName;
public String authorName;
public int bookQty;
public int bookQtyCopy;
// Creating object of Scanner class to
// read input from users
Scanner input = new Scanner(System.in);
// Method
// To add book details
public book()
{
// Display message for taking input later
// taking input via
// nextInt() and nextLine() standard methods
System.out.println("Enter Serial No of Book:");
this.sNo = input.nextInt();
input.nextLine();
System.out.println("Enter Book Name:");
this.bookName = input.nextLine();
System.out.println("Enter Author Name:");
this.authorName = input.nextLine();
System.out.println("Enter Quantity of Books:");
this.bookQty = input.nextInt();
bookQtyCopy = this.bookQty;
}
}
B. File: books.java
Java
// Java Program to Illustrate books class
// To Do all the Operations related to Books such as
// add, check-in, check-out,Valid books,Update books
// Importing required classes
import java.util.Scanner;
// CLass
public class books {
// Class data members
book theBooks[] = new book[50];
public static int count;
Scanner input = new Scanner(System.in);
// Method 1
// To compare books
public int compareBookObjects(book b1, book b2)
{
// If book name matches
if (b1.bookName.equalsIgnoreCase(b2.bookName)) {
// Printing book exists
System.out.println(
"Book of this Name Already Exists.");
return 0;
}
// if book serial matches
if (b1.sNo == b2.sNo) {
// Print book exists
System.out.println(
"Book of this Serial No Already Exists.");
return 0;
}
return 1;
}
// Method 2
// To add book
public void addBook(book b)
{
for (int i = 0; i < count; i++) {
if (this.compareBookObjects(b, this.theBooks[i])
== 0)
return;
}
if (count < 50) {
theBooks[count] = b;
count++;
}
else {
System.out.println(
"No Space to Add More Books.");
}
}
// Method 3
// To search book by serial number
public void searchBySno()
{
// Display message
System.out.println(
"\t\t\t\tSEARCH BY SERIAL NUMBER\n");
// Class data members
int sNo;
System.out.println("Enter Serial No of Book:");
sNo = input.nextInt();
int flag = 0;
System.out.println(
"S.No\t\tName\t\tAuthor\t\tAvailable Qty\t\tTotal Qty");
for (int i = 0; i < count; i++) {
if (sNo == theBooks[i].sNo) {
System.out.println(
theBooks[i].sNo + "\t\t"
+ theBooks[i].bookName + "\t\t"
+ theBooks[i].authorName + "\t\t"
+ theBooks[i].bookQtyCopy + "\t\t"
+ theBooks[i].bookQty);
flag++;
return;
}
}
if (flag == 0)
System.out.println("No Book for Serial No "
+ sNo + " Found.");
}
// Method 4
// To search author by name
public void searchByAuthorName()
{
// Display message
System.out.println(
"\t\t\t\tSEARCH BY AUTHOR'S NAME");
input.nextLine();
System.out.println("Enter Author Name:");
String authorName = input.nextLine();
int flag = 0;
System.out.println(
"S.No\t\tName\t\tAuthor\t\tAvailable Qty\t\tTotal Qty");
for (int i = 0; i < count; i++) {
// if author matches any of its book
if (authorName.equalsIgnoreCase(
theBooks[i].authorName)) {
// Print below corresponding credentials
System.out.println(
theBooks[i].sNo + "\t\t"
+ theBooks[i].bookName + "\t\t"
+ theBooks[i].authorName + "\t\t"
+ theBooks[i].bookQtyCopy + "\t\t"
+ theBooks[i].bookQty);
flag++;
}
}
// Else no book matches for author
if (flag == 0)
System.out.println("No Books of " + authorName
+ " Found.");
}
// Method 5
// To display all books
public void showAllBooks()
{
System.out.println("\t\t\t\tSHOWING ALL BOOKS\n");
System.out.println(
"S.No\t\tName\t\tAuthor\t\tAvailable Qty\t\tTotal Qty");
for (int i = 0; i < count; i++) {
System.out.println(
theBooks[i].sNo + "\t\t"
+ theBooks[i].bookName + "\t\t"
+ theBooks[i].authorName + "\t\t"
+ theBooks[i].bookQtyCopy + "\t\t"
+ theBooks[i].bookQty);
}
}
// Method 6
// To edit the book
public void upgradeBookQty()
{
System.out.println(
"\t\t\t\tUPGRADE QUANTITY OF A BOOK\n");
System.out.println("Enter Serial No of Book");
int sNo = input.nextInt();
for (int i = 0; i < count; i++) {
if (sNo == theBooks[i].sNo) {
// Display message
System.out.println(
"Enter No of Books to be Added:");
int addingQty = input.nextInt();
theBooks[i].bookQty += addingQty;
theBooks[i].bookQtyCopy += addingQty;
return;
}
}
}
// Method 7
// To create menu
public void dispMenu()
{
// Displaying menu
System.out.println(
"----------------------------------------------------------------------------------------------------------");
System.out.println("Press 1 to Add new Book.");
System.out.println("Press 0 to Exit Application.");
System.out.println(
"Press 2 to Upgrade Quantity of a Book.");
System.out.println("Press 3 to Search a Book.");
System.out.println("Press 4 to Show All Books.");
System.out.println("Press 5 to Register Student.");
System.out.println(
"Press 6 to Show All Registered Students.");
System.out.println("Press 7 to Check Out Book. ");
System.out.println("Press 8 to Check In Book");
System.out.println(
"-------------------------------------------------------------------------------------------------------");
}
// Method 8
// To search the library
public int isAvailable(int sNo)
{
for (int i = 0; i < count; i++) {
if (sNo == theBooks[i].sNo) {
if (theBooks[i].bookQtyCopy > 0) {
System.out.println(
"Book is Available.");
return i;
}
System.out.println("Book is Unavailable");
return -1;
}
}
System.out.println("No Book of Serial Number "
+ " Available in Library.");
return -1;
}
// Method 9
// To remove the book from the library
public book checkOutBook()
{
System.out.println(
"Enter Serial No of Book to be Checked Out.");
int sNo = input.nextInt();
int bookIndex = isAvailable(sNo);
if (bookIndex != -1) {
theBooks[bookIndex].bookQtyCopy--;
return theBooks[bookIndex];
}
return null;
}
// Method 10
// To add the Book to the Library
public void checkInBook(book b)
{
for (int i = 0; i < count; i++) {
if (b.equals(theBooks[i])) {
theBooks[i].bookQtyCopy++;
return;
}
}
}
}
C. File: Student.java
Java
// Java Program to Illustrate Student Class
// to take Input from the student and related Information
// Importing required classes
import java.util.Scanner;
// Class
public class student {
// Class member variables
String studentName;
String regNum;
book borrowedBooks[] = new book[3];
public int booksCount = 0;
// Creating object of Scanner class to
// take input from user
Scanner input = new Scanner(System.in);
// Constructor
public student()
{
// Print statement
System.out.println("Enter Student Name:");
// This keywords refers to current instance
this.studentName = input.nextLine();
// Print statement
System.out.println("Enter Registration Number:");
this.regNum = input.nextLine();
}
}
D. File: students.java
Java
// Java Program to Illustrate students Class
// To Do all the Operations related to students:
// add Students,check-in books,check out books,ValidStudent
// Importing required classes
import java.util.Scanner;
// Class
public class students {
// Creating objects of Scanner and students class
Scanner input = new Scanner(System.in);
student theStudents[] = new student[50];
public static int count = 0;
// Method 1
// To add books
public void addStudent(student s)
{
for (int i = 0; i < count; i++) {
if (s.regNum.equalsIgnoreCase(
theStudents[i].regNum)) {
// Print statement
System.out.println(
"Student of Reg Num " + s.regNum
+ " is Already Registered.");
return;
}
}
if (count <= 50) {
theStudents[count] = s;
count++;
}
}
// Method 2
// Displaying all students
public void showAllStudents()
{
// Printing student name and
// corresponding registered number
System.out.println("Student Name\t\tReg Number");
for (int i = 0; i < count; i++) {
System.out.println(theStudents[i].studentName
+ "\t\t"
+ theStudents[i].regNum);
}
}
// Method 3
// To check the Student
public int isStudent()
{
// Display message only
System.out.println("Enter Reg Number:");
String regNum = input.nextLine();
for (int i = 0; i < count; i++) {
if (theStudents[i].regNum.equalsIgnoreCase(
regNum)) {
return i;
}
}
// Print statements
System.out.println("Student is not Registered.");
System.out.println("Get Registered First.");
return -1;
}
// Method 4
// To remove the book
public void checkOutBook(books book)
{
int studentIndex = this.isStudent();
if (studentIndex != -1) {
System.out.println("checking out");
book.showAllBooks();
book b = book.checkOutBook();
System.out.println("checking out");
if (b != null) {
if (theStudents[studentIndex].booksCount
<= 3) {
System.out.println("adding book");
theStudents[studentIndex].borrowedBooks
[theStudents[studentIndex]
.booksCount]
= b;
theStudents[studentIndex].booksCount++;
return;
}
else {
System.out.println(
"Student Can not Borrow more than 3 Books.");
return;
}
}
System.out.println("Book is not Available.");
}
}
// Method 5
// To add the book
public void checkInBook(books book)
{
int studentIndex = this.isStudent();
if (studentIndex != -1) {
// Printing credentials corresponding to student
System.out.println(
"S.No\t\t\tBook Name\t\t\tAuthor Name");
student s = theStudents[studentIndex];
for (int i = 0; i < s.booksCount; i++) {
System.out.println(
s.borrowedBooks[i].sNo + "\t\t\t"
+ s.borrowedBooks[i].bookName + "\t\t\t"
+ s.borrowedBooks[i].authorName);
}
// Display message only
System.out.println(
"Enter Serial Number of Book to be Checked In:");
int sNo = input.nextInt();
for (int i = 0; i < s.booksCount; i++) {
if (sNo == s.borrowedBooks[i].sNo) {
book.checkInBook(s.borrowedBooks[i]);
s.borrowedBooks[i] = null;
return;
}
}
System.out.println("Book of Serial No " + sNo
+ "not Found");
}
}
}
E. File: Library.java
Java
// Java Program to Illustrate Application CLass
// To Create The Menu For the Program
// Importing required classes
import java.util.Scanner;
// Class
public class Library {
// Main driver method
public static void main(String[] args)
{
// Creating object of Scanner class
// to take input from user
Scanner input = new Scanner(System.in);
// Displaying menu
System.out.println(
"********************Welcome to the GFG Library!********************");
System.out.println(
" Select From The Following Options: ");
System.out.println(
"**********************************************************************");
// Creating object of book class
books ob = new books();
// Creating object of students class
students obStudent = new students();
int choice;
int searchChoice;
// Creating menu
// using do-while loop
do {
ob.dispMenu();
choice = input.nextInt();
// Switch case
switch (choice) {
// Case
case 1:
book b = new book();
ob.addBook(b);
break;
// Case
case 2:
ob.upgradeBookQty();
break;
// Case
case 3:
System.out.println(
" press 1 to Search with Book Serial No.");
System.out.println(
" Press 2 to Search with Book's Author Name.");
searchChoice = input.nextInt();
// Nested switch
switch (searchChoice) {
// Case
case 1:
ob.searchBySno();
break;
// Case
case 2:
ob.searchByAuthorName();
}
break;
// Case
case 4:
ob.showAllBooks();
break;
// Case
case 5:
student s = new student();
obStudent.addStudent(s);
break;
// Case
case 6:
obStudent.showAllStudents();
break;
// Case
case 7:
obStudent.checkOutBook(ob);
break;
// Case
case 8:
obStudent.checkInBook(ob);
break;
// Default case that will execute for sure
// if above cases does not match
default:
// Print statement
System.out.println("ENTER BETWEEN 0 TO 8.");
}
}
// Checking condition at last where we are
// checking case entered value is not zero
while (choice != 0);
}
}
Output:
Add Book
Register Student
Rent Book /Check Out Book
Show All Book
Return The Book/Check-In Book
Update The Quantity Of the Book
Search The Book
Show All The Registered Student
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