java做一个图书管理系统

好的，下面是一个简单的Java图书管理系统示例：

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

public class BookManagementSystem {
    private static List<Book> books = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("请选择操作：1. 添加图书 2. 删除图书 3. 修改图书 4. 查询图书 5. 退出");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    addBook();
                    break;
                case 2:
                    deleteBook();
                    break;
                case 3:
                    updateBook();
                    break;
                case 4:
                    queryBook();
                    break;
                case 5:
                    System.out.println("谢谢使用！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选择，请重新输入！");
                    break;
            }
        }
    }

    private static void addBook() {
        System.out.println("请输入图书名称：");
        String name = scanner.next();
        System.out.println("请输入图书作者：");
        String author = scanner.next();
        System.out.println("请输入图书价格：");
        double price = scanner.nextDouble();
        Book book = new Book(name, author, price);
        books.add(book);
        System.out.println("添加成功！");
    }

    private static void deleteBook() {
        System.out.println("请输入要删除的图书名称：");
        String name = scanner.next();
        boolean flag = false;
        for (Book book : books) {
            if (book.getName().equals(name)) {
                books.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！");
        }
    }

    private static void updateBook() {
        System.out.println("请输入要修改的图书名称：");
        String name = scanner.next();
        boolean flag = false;
        for (Book book : books) {
            if (book.getName().equals(name)) {
                System.out.println("请输入新的图书名称：");
                String newName = scanner.next();
                book.setName(newName);
                System.out.println("请输入新的图书作者：");
                String author = scanner.next();
                book.setAuthor(author);
                System.out.println("请输入新的图书价格：");
                double price = scanner.nextDouble();
                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！");
        }
    }

    private static void queryBook() {
        System.out.println("请输入要查询的图书名称：");
        String name = scanner.next();
        boolean flag = false;
        for (Book book : books) {
            if (book.getName().equals(name)) {
                System.out.println(book);
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("没有找到该图书！");
        }
    }

    static class Book {
        private String name;
        private String author;
        private double price;

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

        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 double getPrice() {
            return price;
        }

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

        @Override
        public String toString() {
            return "书名：" + name + " 作者：" + author + " 价格：" + price;
        }
    }
}

运行程序后，用户可以选择添加、删除、修改或查询图书。添加图书需要输入图书名称、作者和价格，删除图书需要输入图书名称，修改图书需要输入原有的图书名称和新的图书信息，查询图书需要输入图书名称。系统会根据用户的选择执行相应的操作，并输出结果。用户可以选择退出程序。