一个用Java写的图书管理系统

奋进的小暄

已于 2025-02-03 10:29:03 修改

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文章标签： java 前端开发语言

于 2025-02-02 12:36:45 首次发布

本文链接：https://blog.youkuaiyun.com/2301_81564787/article/details/145419049

版权

package book;

public class Book {
    private String name;//书名
    private String author;
    private int price;
    private String type;
    private boolean isBorrowed;

    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) ? " 已借出" : " 未借出") +
                //", isBorrowed=" + isBorrowed +
                '}';
    }
}

package book;

public class BookList {
    private Book[] books = new Book[10];
    private int usedSize;//有效的数据个数【实际放的书的个数】


    public BookList() {
        this.books[0] = new Book("三国演义","罗贯中",10,"小说");
        this.books[1] = new Book("西游记","吴承恩",59,"小说");
        this.books[2] = new Book("红楼梦","曹雪芹",16,"小说");

        this.usedSize = 3;
    }

    //有其他方法？  有
    public int getUsedSize() {
        return usedSize;
    }
    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }
    public Book getBook(int pos) {
        return books[pos];
    }

    public void setBook(int pos,Book book) {
        this.books[pos] = book;
    }
    public Book[] getBooks() {
        return books;
    }
}

package ioperations;
import book.Book;
import book.BookList;

import java.util.Scanner;
    public class AddOperation implements IOPeration {
        public void work(BookList bookList) {
            System.out.println("新增图书.....");

            //1. 判满
            int currentSize = bookList.getUsedSize();
            if (currentSize == bookList.getBooks().length) {
                System.out.println("书架满了 不能放了.....");
                return;
            }


            //2. 构建对象
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入书名：");
            String name = scanner.nextLine();

            System.out.println("请输入作者：");
            String author = scanner.nextLine();

            System.out.println("请输入书的类型：");
            String type = scanner.nextLine();

            System.out.println("请输入价格：");
            int price = scanner.nextInt();


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

            //3. 判断书架有没有这本书
            for (int i = 0; i < currentSize; i++) {
                Book book = bookList.getBook(i);
                if (book.getName().equals(name)) {
                    System.out.println("有这本书不能插入！");
                    return;
                }
            }

            //4.插入这本书
            bookList.setBook(currentSize, newBook);

            bookList.setUsedSize(currentSize + 1);

            System.out.println("新增图书成功！！！");

        }
    }

package ioperations;
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");


            Scanner scanner = new Scanner(System.in);
            System.out.printf("请输入你借阅的书名：");
            String name = scanner.nextLine();

            int currentSize = bookList.getUsedSize();

            for (int i = 0; i < currentSize; i++) {
                Book book = bookList.getBook(i);

                if (book.getName().equals(name)) {
                    if (book.isBorrowed()) {
                        System.out.println("这本书已经被借出了！");
                        return;
                    }
                    book.setBorrowed(true);
                    System.out.println("借阅成功！");
                    return;
                }
            }
            System.out.println("没有你要借阅的这本书....");
        }
    }

package ioperations;

import book.Book;
import book.BookList;

import java.util.Scanner;
public class DelOperation implements IOPeration{
    public void work(BookList bookList) {
        System.out.println("删除图书.....");

        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入你删除的书名：");
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();

        int pos = -1;
        //找到这本书
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                pos = i;
                break;
            }
        }

        if(i == currentSize) {
            System.out.println("没有你要删除的书！");
            return ;
        }

        //这里开始删除
        for (int j = pos; j < currentSize-1; j++) {
            //bookList[j] = bookList[j+1];
            Book book = bookList.getBook(j+1);

            bookList.setBook(j,book);
        }

        bookList.setBook(currentSize-1,null);

        bookList.setUsedSize(currentSize-1);
        System.out.println("删除成功！！！！");
    }
}

package ioperations;

import book.BookList;
public class ExitOperation implements IOPeration {
    @Override
    public void work(BookList bookList) {
        System.out.println("退出系统....");
        System.exit(0);
    }
}

package ioperations;

import book.Book;
import book.BookList;
import java.util.Scanner;
public class FindOperation implements IOPeration{
    public void work(BookList bookList) {
        System.out.println("查找图书.....");
        Scanner scanner = new Scanner(System.in);
        System.out.printf("请输入你的书名：");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                System.out.println("找到了这本书：");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有你要找的这本书....");
    }
}

package ioperations;

import book.BookList;

public interface IOPeration {
    void work (BookList bookList);

}

这个在ioperation包下创建的类是一个接口。

package ioperations;

import book.Book;
import book.BookList;

import java.util.Scanner;
public class ReturnOperation implements IOPeration{
    public void work(BookList bookList) {
        System.out.println("归还图书....");
        Scanner scanner = new Scanner(System.in);
        System.out.printf("请输入你归还的书名：");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();

        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);

            if(book.getName().equals(name)) {
                if(book.isBorrowed()) {
                    book.setBorrowed(false);
                    System.out.println("归还成功！");
                    return;
                }
            }
        }
        System.out.println("没有你要归还的图书！！！");
    }
}

package ioperations;

import book.Book;
import book.BookList;
public class ShowOperation implements IOPeration{

    public void work(BookList bookList) {
        System.out.println("显示图书....");
        int currentSize = bookList.getUsedSize();//3
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            System.out.println(book);
            //Book book1 = bookList[i];
        }
    }
}

package user;

import ioperations.*;

import java.util.Scanner;

/**
 * @Author 12629
 * @Description：
 */
public class AdminUser extends User {

    public AdminUser(String name) {
        super(name);
        this.ioPerations = new IOPeration[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new ShowOperation()
        };
    }

    public int menu() {
        System.out.println("欢迎" + this.name + "来到图书系统");
        System.out.println("*******管理员菜单*******");
        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. 退出系统");
        System.out.println("**********************");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的操作：");
        int choice = scanner.nextInt();
        return choice;
    }
}

package user;

import ioperations.*;

import java.util.Scanner;

/**
 * @Author 12629
 * @Description：
 */
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"+this.name+"来到图书系统");
        System.out.println("*******普通用户菜单*******");
        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. 退出系统");
        System.out.println("**********************");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的操作：");
        int choice = scanner.nextInt();
        return choice;
    }
}

package user;
import book.BookList;
import ioperations.IOPeration;
public abstract class User {
    protected String name;
    //此时这个数组 没有初始化
    public IOPeration[] ioPerations;

    //此时 这个里 为了 子类当中 帮我初始化 父类的成员
    public User(String name) {
        this.name = name;
    }

    public abstract int menu();

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

import book.BookList;
import ioperations.IOPeration;
import user.AdminUser;
import user.NormalUser;
import user.User;

import java.util.Scanner;


public class Main {

    public static User login() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的姓名：");
        String name = scanner.nextLine();

        System.out.println("请输入你的身份，1：管理员   2：普通用户");

        int choice = scanner.nextInt();

        if (choice == 1) {
            return new AdminUser(name);
        } else {
            return new NormalUser(name);
        }
    }

    public static void main(String[] args) {
        BookList bookList = new BookList();

        User user = login();

        while (true) {
            int choice = user.menu();

            user.doIoperation(choice, bookList);

            //user.ioPerations[choice].work(bookList);
        }
    }
}