Aquí se supone que debemos diseñar e implementar un sistema de administración de bibliotecas simple usando una declaración de cambio en Java , donde han operado las siguientes operaciones Agregar un nuevo libro, sacar un libro, mostrar el estado de un libro específico, buscar un libro específico y mostrar los detalles del libro usando diferentes clases
Menú de gestión de bibliotecas
Aquí está el conjunto de listas de opciones que crearemos que son las siguientes:
| Salir de la aplicación |
|---|
| Agregar un nuevo libro |
| Cantidad de actualización de un libro |
| Buscar un libro |
| Mostrar todos los libros |
| Registrar Estudiante |
| Mostrar todos los estudiantes registrados |
| Echa un vistazo al libro |
| Libro de registro |
Implementación:
Crearemos 5 archivos, incluida nuestra clase de aplicación (principal) responsable de la ejecución de nuestro miniproyecto, que se enumeran a continuación:
- Biblioteca
- Estudiantes
- Alumno
- libros
- libro
Nota: De acuerdo con las convenciones de nomenclatura en java , es una buena práctica tener la inicial de la clase con letras mayúsculas. Aquí nos adherimos a las minúsculas para una mejor comprensión del código.
A. Archivo: libro.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. Archivo: libros.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 credentails
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. Archivo: 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. Archivo: estudiantes.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. Archivo: Biblioteca.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);
}
}
Producción:
Añadir libro
Registrar Estudiante
Libro de alquiler / Libro de salida
Mostrar todo el libro
Devolver el Libro/Libro de Entrada
Actualizar la cantidad del libro
Buscar en el libro
Mostrar todo el estudiante registrado
Publicación traducida automáticamente
Artículo escrito por dragonuncaged y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA