Java写一个图书员管理系统

好的，我可以给你提供一个基本的图书员管理系统的代码示例，你可以根据自己的需求进行修改和完善。

首先，定义一个Book类来表示图书信息，包括书名、作者、出版社、价格等属性：

public class Book {
    private int id;
    private String name;
    private String author;
    private String publisher;
    private double price;
    
    // 构造函数
    public Book(int id, String name, String author, String publisher, double price) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.publisher = publisher;
        this.price = price;
    }
    
    // getter和setter方法
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    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 String getPublisher() {
        return publisher;
    }
    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    
    // toString方法，用于将图书信息转换为字符串
    @Override
    public String toString() {
        return "Book [id=" + id + ", name=" + name + ", author=" + author + ", publisher=" + publisher + ", price="
                + price + "]";
    }
}

然后，定义一个BookManager类来管理图书信息，包括添加图书、删除图书、修改图书、查询图书等操作：

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class BookManager {
    private List<Book> bookList = new ArrayList<Book>();
    
    // 添加图书
    public void addBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入书名：");
        String name = scanner.nextLine();
        System.out.print("请输入作者：");
        String author = scanner.nextLine();
        System.out.print("请输入出版社：");
        String publisher = scanner.nextLine();
        System.out.print("请输入价格：");
        double price = scanner.nextDouble();
        int id = bookList.size() + 1;  // 生成图书ID
        Book book = new Book(id, name, author, publisher, price);
        bookList.add(book);
        System.out.println("添加成功！");
    }
    
    // 删除图书
    public void deleteBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除的图书ID：");
        int id = scanner.nextInt();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId() == id) {
                bookList.remove(book);
                flag = true;
                break;
            }
        }
        if (flag) {
            System.out.println("删除成功！");
        } else {
            System.out.println("没有找到该图书！");
        }
    }
    
    // 修改图书
    public void updateBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要修改的图书ID：");
        int id = scanner.nextInt();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId() == id) {
                System.out.print("请输入新书名：");
                String name = scanner.nextLine();
                System.out.print("请输入新作者：");
                String author = scanner.nextLine();
                System.out.print("请输入新出版社：");
                String publisher = scanner.nextLine();
                System.out.print("请输入新价格：");
                double price = scanner.nextDouble();
                book.setName(name);
                book.setAuthor(author);
                book.setPublisher(publisher);
                book.setPrice(price);
                flag = true;
                break;
            }
        }
        if (flag) {
            System.out.println("修改成功！");
        } else {
            System.out.println("没有找到该图书！");
        }
    }
    
    // 查询图书
    public void queryBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要查询的图书ID：");
        int id = scanner.nextInt();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId() == id) {
                System.out.println(book);
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("没有找到该图书！");
        }
    }
    
    // 显示所有图书
    public void showAll() {
        for (Book book : bookList) {
            System.out.println(book);
        }
    }
}

最后，编写一个测试类来测试图书员管理系统：

public class Test {
    public static void main(String[] args) {
        BookManager manager = new BookManager();
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加图书");
            System.out.println("2. 删除图书");
            System.out.println("3. 修改图书");
            System.out.println("4. 查询图书");
            System.out.println("5. 显示所有图书");
            System.out.println("0. 退出系统");
            int choice = scanner.nextInt();
            switch (choice) {
            case 1:
                manager.addBook();
                break;
            case 2:
                manager.deleteBook();
                break;
            case 3:
                manager.updateBook();
                break;
            case 4:
                manager.queryBook();
                break;
            case 5:
                manager.showAll();
                break;
            case 0:
                System.out.println("退出系统！");
                System.exit(0);
            default:
                System.out.println("输入有误，请重新输入！");
                break;
            }
        }
    }
}

这样，一个简单的图书员管理系统就完成了！