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Library borrowing system "suggested collection"
2022-07-28 21:28:00 【Full stack programmer webmaster】
Hello everyone , I meet you again , I'm your friend, Quan Jun .
Library borrowing system One 、 Library borrowing system is an information management system for the operation of book information . The book information includes the title 、 author 、 Number 、 Whether to lend . This system is aimed at two types of users （ Librarians and students ） Use , For librarians , You can view the list of books 、 Find books 、 New book information 、 Delete books 、 Exit the login operation ; For students , You can view the list of books 、 Find books 、 Borrow books 、 Return the books 、 Exit the login operation .
Two 、 Code section 1.book Package created Book The establishment of class is important for library borrowing system , Regard books as an object , According to the book The attributes of , Define the private properties of a series of books , And accessors that operate on these properties （get()） And setters （set（））.
package book;
public class Book {
private String name;// Title
private String author;// The author of the book
private int num;// The number of the book
private boolean flag;// Judge whether the book has been borrowed
public Book(String name, String author, int num) {
this.name = name;
this.author = author;
this.num = num;
}
public String getName() {
return name;
}
public String getAuthor() {
return author;
}
public int getNum() {
return num;
}
public void setFlag(boolean borrowed) {
flag = borrowed;
}
public boolean getFlag() {
return flag;
}
public String toString() {
return "name:" + name + " author:" + author + " num:" + num +" "+ (flag ? " It has been lent out " : " Not lent ");
}
}Booklist Class establishment Booklist Class is used to store book information , And aiming at Booklist Class to complete addition, deletion, modification and other related operations .
package book;
public class Booklist {
public Book books[];
private int number;
public Booklist() {
this.books = new Book[20];
this.books[0] = new Book("Java Basic language course ", " Li Dongming 、 Zhang Lijuan ", 1);
this.books[1] = new Book("C Programming ", " Tan Haoqiang ", 2); this.books[2] = new Book(" Advanced mathematics I", " Tongji ", 3); this.books[3] = new Book(" Advanced mathematics II", " Tongji ", 4); this.books[4] = new Book(" data structure ", " YanWeiMin ", 5); this.number = 5;
}
public void setBook(int b, Book book) {
books[b] = book;
}
public Book getBook(int b) {
return books[b]; } public void setNumber(int n) {
number = n; }
public int getNumber( ) {
return number; }
}2.operation Package created Operation Class establishment ① This is all operation （ lookup , increase , Delete , Borrow , The return , sign out ） Common interface ;② Need one oper（） Method , This method is aimed at Booklist Class to operate on .
package operation;
import book.Booklist;// Interface
public interface Operation {
void oper(Booklist booklist);
}Find book information （ According to the book title or number ） Select the corresponding search function , According to your input name perhaps number Search for .
package operation;
import java.util.Scanner;
import book.Booklist;// Find books
public class Find implements Operation {
public void oper(Booklist booklist) {
int i;
Scanner reader = new Scanner(System.in); System.out.println(" Please enter the title of the book you are looking for ："); String name = reader.next();
for (i = 0; i < booklist.getNumber(); i++) {
//System.out.println(booklist.getBook(i).getName().equals(name));
if (booklist.getBook(i).getName().equals(name)) {
System.out.println(" Find the book you need ："+booklist.books[i]);
return;
}
}
if (i >= booklist.getNumber()) {
System.out.println(" I'm sorry ！ The book you need is not found ！");
}
}
}package operation;
import java.util.Scanner;
import book.Booklist; Find books by number
public class Find1 implements Operation{
public void oper(Booklist booklist) {
int i;
Scanner reader = new Scanner(System.in);
System.out.println(" Please enter the number of the book you are looking for ：");
int number = reader.nextInt();
for (i = 0; i < booklist.getNumber(); i++) {
//System.out.println(booklist.getBook(i).getNum()==number);
if (booklist.getBook(i).getNum()==number){
System.out.println(" Find the book you need ："+booklist.books[i]);
return;
}
}
if (i >= booklist.getNumber()) {
System.out.println(" I'm sorry ！ The book you need is not found ！"); }
}
}Add books Input the information of the new book in the main function interface , Assign these information to Book Class corresponding information , And insert the book Booklist Class books Array .
package operation;import java.util.Scanner;import book.Book;import book.Booklist;// Add books
public class Add implements Operation {
public void oper(Booklist booklist) {
Scanner reader = new Scanner(System.in); System.out.println(" Please enter the books to be added ：");
String name = reader.nextLine(); System.out.println(" Please enter the author of the book ：");
String author = reader.nextLine(); System.out.println(" Please enter the book number ：");
int num = reader.nextInt();
Book book = new Book(name, author, num);
int a = booklist.getNumber();
booklist.setBook(a, book);
booklist.setNumber(a + 1);
System.out.println(" Success increases "+name+" Books !");
}
}Delete books （ According to the book title or number ）
package operation;import java.util.Scanner;import book.Book;import book.Booklist;// Delete books
public class Delete implements Operation {
public void oper(Booklist booklist) {
System.out.println(" Please enter the books you need to delete ："); Scanner reader = new Scanner(System.in);
String name = reader.nextLine();
int de = booklist.getNumber();
int b = 0;
for (int i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (book.getName().equals(name)) {
b = i;
break;
}
}
for (int j = b; j < de - 1; j++) {
booklist.setBook(j, booklist.getBook(j + 1));
}
booklist.setNumber(de - 1); System.out.println(" Successfully deleted the book ！");
}
}package operation;import java.util.Scanner;import book.Book;import book.Booklist;// Delete books by number
public class Delete1 implements Operation{
public void oper(Booklist booklist) {
System.out.println(" Please enter the books you need to delete ："); Scanner reader = new Scanner(System.in);
int number = reader.nextInt();
int de = booklist.getNumber();
int i;
for (i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (book.getNum()==number) {
break;
}
}
if(i>booklist.getNumber()) {
return ;
}
Book book1=booklist.getBook(de-1);
booklist.setBook(i, book1);
booklist.setNumber(de-1);
System.out.println(" Successfully deleted the book ！");
}
}Borrow books ( According to the book title or number )
package operation;import java.util.Scanner;import book.Book;import book.Booklist;// Borrow books
public class Borrow implements Operation {
public void oper(Booklist booklist) {
Scanner reader = new Scanner(System.in); System.out.println(" Please enter the books you need to borrow ："); String name = reader.next();
int i;
for (i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (booklist.getBook(i).getName().equals(name)) {
if (book.getFlag()) {
System.out.println(" I'm sorry ！ This book "+book.getName()+" Has been borrowed ！");
}
else {
book.setFlag(true); System.out.println(" Successfully borrow books "+book.getName()+"！");
break;
}
}
} }}package operation;import java.util.Scanner;import book.Book;import book.Booklist;
public class Borrow1 implements Operation{
public void oper(Booklist booklist) {
Scanner reader = new Scanner(System.in); System.out.println(" Please enter the number of the book you need to borrow ："); int number = reader.nextInt();
int i;
for (i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (book.getNum()==number) {
if (book.getFlag()) {
System.out.println(" I'm sorry ！ This book "+book.getName()+" Has been borrowed ！");
}
else {
book.setFlag(true);
System.out.println(" Successfully borrow books "+book.getName()+"！");
break;
} } } }}Return the books ( According to the book title or number )
package operation;import java.util.Scanner;import book.Book;import book.Booklist;// Return the books
public class Return implements Operation {
public void oper(Booklist booklist) {
Scanner reader = new Scanner(System.in);
System.out.println(" Please enter the books you need to return ：");
String name = reader.nextLine();
for (int i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (book.getName().equals(name)) {
System.out.println(" Successful return of books ！");
}
book.setFlag(false); } }}package operation;import java.util.Scanner;import book.Book;import book.Booklist;
public class Return1 implements Operation{
public void oper(Booklist booklist) {
Scanner reader = new Scanner(System.in);
System.out.println(" Please enter the books you need to return ：");
int number = reader.nextInt();
for (int i = 0; i < booklist.getNumber(); i++) {
Book book = booklist.getBook(i);
if (book.getNum()==number) {
System.out.println(" Successful return of books ！");
}
book.setFlag(false); } }}Exit the system
package operation;import book.Booklist;
public class Exit implements Operation {
public void oper(Booklist booklist) {
System.out.println(" Thank you for using the library system !"); System.exit(0);// Run the program normally and exit the program
}}3.user Package created This system is designed for two types of users ( Administrators and students ) user ( abstract class )
package users;import book.Booklist;import operation.Operation;
public abstract class User {
public String name;
public Operation operations[];
public User(String name) {
this.name = name;
}
public abstract int meanu();
public void opera(int choice, Booklist booklist) {
operations[choice].oper(booklist);
}}Administrators
package users;import java.util.Scanner;import operation.Add;import operation.Delete;import operation.Delete1;import operation.Display;import operation.Exit;import operation.Find;import operation.Find1;import operation.Operation;// Administrators
public class Administrator extends User {
public int meanu() {
Scanner reader = new Scanner(System.in);
System.out.println("\t-----------------------------------");
System.out.println("\t\t********0. List of books ********");
System.out.println("\t********1. Find books ( According to the title )********");
System.out.println("\t********2. Find books ( According to the number )********");
System.out.println("\t\t********3. Add books ********");
System.out.println("\t********4. Delete books ( According to the title )********");
System.out.println("\t********5. Delete books ( According to the number )********");
System.out.println("\t\t********6. Log out ********");
System.out.println("\t-----------------------------------");
int choice = reader.nextInt();
return choice;
}
public Administrator(String name) {
super(name);
this.operations = new Operation[] {
new Display(), new Find(),new Find1(), new Add(), new Delete(),new Delete1(), new Exit() };
}}Student
package users;import java.util.Scanner;import operation.Borrow;import operation.Borrow1;import operation.Display;import operation.Exit;import operation.Find;import operation.Find1;import operation.Operation;import operation.Return;import operation.Return1;// Student
public class Student extends User {
public int meanu() {
Scanner reader = new Scanner(System.in);
System.out.println("\t-----------------------------------");
System.out.println("\t\t********0. List of books ********");
System.out.println("\t********1. Find books ( According to the title )********");
System.out.println("\t********2. Find books ( According to the number )********");
System.out.println("\t********3. Borrow books ( According to the title )********");
System.out.println("\t********4. Borrow books ( According to the number )********");
System.out.println("\t********5. Return the books ( According to the title )********");
System.out.println("\t********6. Return the books ( According to the number )********");
System.out.println("\t\t********7. Log out ********");
System.out.println("\t-----------------------------------");
int choice = reader.nextInt();
return choice; }
public Student(String name) {
super(name);
this.operations = new Operation[] {
new Display(), new Find(),new Find1(), new Borrow(),new Borrow1(), new Return(),new Return1(), new Exit() };
}}4.Main Class establishment stay Main Class has a main function interface of system entry , In this interface , Select the function that the user wants to achieve by entering the function number , The corresponding functions of this main function are realized through operation The methods of classes in the package interact .
package main;import java.util.Scanner;import book.Booklist;import users.Administrator;import users.Student;import users.User;// Login screen
class Enter {
private static String password = "1234567";// Set the password to 123456
private static String password1 = "123456";// Set the password to 123456
public static User login() {
Scanner reader = new Scanner(System.in);
System.out.println("******** Sign in ********");
System.out.println(" Please enter a user name :");
String name = reader.nextLine(); // Administrator login
if ("administrator".equals(name)) {
System.out.println(" Please input a password :");
if (reader.next().equals(password)) {
System.out.println(" Welcome to the library borrowing system !");
User Administrator = new Administrator(name);
return Administrator;
}
else {
System.out.println(" Wrong password ！ Please re-enter the password !"); } } // Students log in
if ("student".equals(name)) {
System.out.println(" Please input a password :");
if (reader.next().equals(password1)) {
System.out.println(" Welcome to the library borrowing system !");
User Student = new Student(name);
return Student;
}
else {
System.out.println(" Wrong password ！ Please re-enter the password !"); }
}
return null; }}
public class Main {
public static void main(String args[]) {
Booklist booklist = new Booklist();
User user = Enter.login();
while (true) {
int choice = user.meanu();
user.opera(choice, booklist);
}
}}Publisher ： Full stack programmer stack length , Reprint please indicate the source ：https://javaforall.cn/128815.html Link to the original text ：https://javaforall.cn
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