用java写一个简易的图书管理系统

好的，我可以给您提供一个简单的Java图书管理系统的代码框架，您可以在此基础上进行修改和完善。

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

class Book {
    private String title;
    private String author;
    private int id;

    public Book(String title, String author, int id) {  // 构造函数
        this.title = title;
        this.author = author;
        this.id = id;
    }

    public String getTitle() {  // 获取书名
        return title;
    }

    public String getAuthor() {  // 获取作者
        return author;
    }

    public int getId() {  // 获取书籍编号
        return id;
    }
}

class Library {
    private ArrayList<Book> books = new ArrayList<Book>();  // 存储书籍的ArrayList

    public void addBook(Book book) {  // 添加书籍
        books.add(book);
    }

    public void showBooks() {  // 显示所有书籍
        for (Book book : books) {
            System.out.println("Title: " + book.getTitle());
            System.out.println("Author: " + book.getAuthor());
            System.out.println("ID: " + book.getId());
            System.out.println();
        }
    }

    public Book findBook(int id) {  // 根据书籍编号查找书籍
        for (Book book : books) {
            if (book.getId() == id) {
                return book;
            }
        }
        return null;
    }

    public void removeBook(int id) {  // 根据书籍编号删除书籍
        for (Book book : books) {
            if (book.getId() == id) {
                books.remove(book);
                return;
            }
        }
    }
}

public class BookManagementSystem {
    public static void main(String[] args) {
        Library library = new Library();  // 创建一个图书馆对象
        Scanner scanner = new Scanner(System.in);
        while (true) {  // 进入主循环
            System.out.println("1. Add book");
            System.out.println("2. Show all books");
            System.out.println("3. Find book");
            System.out.println("4. Remove book");
            System.out.println("5. Exit");
            System.out.println("Please enter your choice (1-5):");
            int choice = scanner.nextInt();
            scanner.nextLine();  // 吃掉多余的回车
            switch (choice) {
                case 1:  // 添加书籍
                    System.out.println("Please enter the book title:");
                    String title = scanner.nextLine();
                    System.out.println("Please enter the book author:");
                    String author = scanner.nextLine();
                    System.out.println("Please enter the book ID:");
                    int id = scanner.nextInt();
                    scanner.nextLine();  // 吃掉多余的回车
                    Book book = new Book(title, author, id);
                    library.addBook(book);
                    break;
                case 2:  // 显示所有书籍
                    library.showBooks();
                    break;
                case 3:  // 查找书籍
                    System.out.println("Please enter the book ID:");
                    id = scanner.nextInt();
                    scanner.nextLine();  // 吃掉多余的回车
                    book = library.findBook(id);
                    if (book != null) {
                        System.out.println("Title: " + book.getTitle());
                        System.out.println("Author: " + book.getAuthor());
                        System.out.println("ID: " + book.getId());
                        System.out.println();
                    } else {
                        System.out.println("Book not found.");
                    }
                    break;
                case 4:  // 删除书籍
                    System.out.println("Please enter the book ID:");
                    id = scanner.nextInt();
                    scanner.nextLine();  // 吃掉多余的回车
                    library.removeBook(id);
                    break;
                case 5:  // 退出
                    return;
                default:  // 处理非法输入
                    System.out.println("Invalid choice.");
            }
        }
    }
}

这个简单的图书管理系统可以实现以下功能：
1. 添加书籍
2. 显示所有书籍
3. 根据书籍编号查找书籍
4. 根据书籍编号删除书籍
5. 退出

您可以在此基础上进行修改和完善，比如加入借书、还书等功能。