Bagaimana untuk melaksanakan sistem pengurusan perpustakaan menggunakan kod Java

1. Pengenalan Fungsi

Sistem pengurusan perpustakaan ini menggunakan alat pembangunan IDEA untuk merealisasikan

Sistem perpustakaan mempunyai dua identiti untuk akses:

1. Identiti pentadbir:

2 identiti pengguna biasa:

kami Di sana. adalah tiga pakej kesemuanya, iaitu buku, operasi, dan pelaksanaan pengguna

2. Pakej utama

utama. Fungsi Terutamanya menjalankan proses umum, permulaan perpustakaan, log masuk ke sistem pengurusan perpustakaan, dan pemilihan operasi khusus, iaitu pelaksanaan

import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        //1.先初始化图书库，以及初始化:
        BookList bookList = new BookList();

        //2.登录
        User user = login();//向上转型，User接受管理员或者用户对象

        //3.打印菜单,进行具体操作
        while(true) {
            int choice = user.menu();
            user.doOperation(choice,bookList);
        }
    }
}

Fungsi log masuk:

 public static User login() {
        System.out.println("请输入你的姓名: ");
        Scanner scanner = new Scanner(System.in);
        String userName = scanner.nextLine();
        System.out.println("请输入你的身份: 1-> 管理员 2-> 用户");
        int choice = scanner.nextInt();
        if(choice == 1) {
            return new AdminUser(userName);
        }else {
            return new NormalUser(userName);
        }
    }

<. 🎜> 3. Pakej pengguna

Oleh kerana terdapat dua sistem, pentadbir dan pengguna biasa, kami mengekstrak atribut biasa ke dalam kelas abstrak Pengguna untuk mencapai penggunaan semula kod

1. Pengguna

package user;

import book.BookList;
import operations.IOperation;

public abstract class User {
    protected String name;

    IOperation[] iOperations;
    public User(String name) {
        this.name = name;
    }

    public abstract int menu();

    public void doOperation(int choice, BookList bookList) {
        iOperations[choice].work(bookList);
    }
}

2. AdminUser

package user;

import operations.*;

import java.util.Scanner;
public class AdminUser extends User{

    public AdminUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DisplayOperation()
        };
    }
    public int menu() {
        System.out.println("欢迎: "+name+"来到图书馆");
        System.out.println("**********************************");
        System.out.println("1. 查找图书");
        System.out.println("2. 新增图书");
        System.out.println("3. 删除图书");
        System.out.println("4. 显示图书");
        System.out.println("0. 退出图书");
        System.out.println("**********************************");
        System.out.println("请输入你的操作: ");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

3. Pengguna Biasa

package user;

import operations.*;

import java.util.Scanner;
public class NormalUser extends User{

    public NormalUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation()
        };
    }

    public int menu() {
        System.out.println("欢迎: "+name+"来到图书馆");
        System.out.println("**********************************");
        System.out.println("1. 查找图书");
        System.out.println("2. 借阅图书");
        System.out.println("3. 归还图书");
        System.out.println("0. 退出图书");
        System.out.println("**********************************");
        System.out.println("请输入你的操作: ");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

4 Tulis atribut buku, dan mulakan buku dalam pustaka buku dalam operasi

1 pakej

Sistem pengurusan perpustakaan kami mempunyai banyak operasi khusus untuk memudahkan polimorfisme dan semakan ralat kemudian, kami melaksanakan antara muka IOperation tertentu dan melaksanakan antara muka ini untuk setiap operasi tertentu.

1 antara muka

package book;
public class Book {
    private String name;//书名
    private String author;//作者
    private int price;//价格
    private String type;//书的类型
    private boolean isBorrowed;//书默认未借出

    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public boolean isBorrowed() {
        return isBorrowed;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ","+ ((isBorrowed == true) ? "该书已借出" : "该书未借出" )+
                '}';
    }
}

2. AddOperation

package book;
public class BookList {
    public Book[] books = new Book[100];
    public int usedSize;//用来存当前共有多少本书


    /**
     * 事先通过代码块
     *
     * 事先存进去三本书
     */
    {
        books[0] = new Book("java","高斯林",95,"IT");
        books[1] = new Book("C++","姚琳",93,"IT");
        books[2] = new Book("python","马瑟斯",80,"IT");
        this.usedSize = 3;
    }

    public Book getPos(int pos) {
        //获取某一位置的书
        return books[pos];
    }

    public void setBooks(Book book,int pos) {
        //存储一本书 到指定位置
        books[pos] = book;

    }
    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }
}

Tambah buku:

3 BorrowOperation

pinjam buku:

package operations;

import book.BookList;

public interface IOperation {
    void work(BookList bookList);
}

<. 🎜>4. DelOperation

Padam buku:

package operations;

import book.Book;
import book.BookList;

import java.util.Scanner;
public class AddOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("新增图书! ");
        System.out.println("请输入要新增的图书的名字: ");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入要新增的图书的作者: ");
        String author = scanner.nextLine();
        System.out.println("请输入要新增的图书的价格: ");
        int price = scanner.nextInt();
        System.out.println("请输入要新增的图书的类型: ");
        String type = scanner.nextLine();

        Book book = new Book(name,author,price,type);

        //1.获取当前书存放的位置
        int curSize = bookList.getUsedSize();
        //2.把书放在指定位置
        bookList.setBooks(book,curSize);
        //3.更新书的个数
        bookList.setUsedSize(curSize+1);

    }
}

5. DisplayOperation

Paparan buku:

package operations;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class BorrowOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("借阅图书! ");
        System.out.println("请输入要借阅的图书的名字: ");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())) {
                if(book.isBorrowed()) {
                    System.out.println("该书已经被借出! ");
                }else {
                    book.setBorrowed(true);
                    System.out.println("借阅图书成功! ");
                    return;
                }
            }
        }
        System.out.println("没有你要借阅的书! ");
    }
}

6

Keluar dari buku:

package operations;

import book.Book;
import book.BookList;

import java.util.Scanner;
public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书! ");
        System.out.println("请输入要删除的图书: ");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();

        //查找图书是否有此图书，记录下标
        int index = -1;
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            Book book = bookList.getPos(i);
            if(name.equals(book.getName())) {
               index = i;
               break;
            }
        }
        if(index == -1) {
            System.out.println("没有 "+name+"这本书!");
            return;
        }
        for (int i = index; i < bookList.getUsedSize()-1; i++) {
            Book book = bookList.getPos(i+1);
            bookList.setBooks(book,i);
        }

        //删除的书,要置空
        bookList.setBooks(null, bookList.getUsedSize()-1);
        bookList.setUsedSize(bookList.getUsedSize()-1);
    }
}

7 FindOperation

Cari buku:

package operations;

import book.Book;
import book.BookList;
public class DisplayOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("显示图书! ");
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            Book book = bookList.getPos(i);
            System.out.println(book);
        }
    }
}

8.

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