java编写一个图书管理系统

Java是一种面向对象的编程语言，它可以用于开发各种类型的应用程序，包括图书管理系统。下面是一个简单的Java图书管理系统的实现方式：

1. 首先，需要定义一个Book类，该类包含书籍的基本信息，如书名、作者、出版社、ISBN号等。可以使用以下代码定义Book类：

public class Book {
    private String title;
    private String author;
    private String publisher;
    private String isbn;

    public Book(String title, String author, String publisher, String isbn) {
        this.title = title;
        this.author = author;
        this.publisher = publisher;
        this.isbn = isbn;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public String getPublisher() {
        return publisher;
    }

    public String getIsbn() {
        return isbn;
    }
}

2. 接下来，需要定义一个BookManager类，该类包含对图书进行管理的方法，如添加图书、删除图书、查找图书等。可以使用以下代码定义BookManager类：

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

public class BookManager {
    private List<Book> books;

    public BookManager() {
        books = new ArrayList<>();
    }

    public void addBook(Book book) {
        books.add(book);
    }

    public void removeBook(Book book) {
        books.remove(book);
    }

    public Book findBookByTitle(String title) {
        for (Book book : books) {
            if (book.getTitle().equals(title)) {
                return book;
            }
        }
        return null;
    }

    public Book findBookByAuthor(String author) {
        for (Book book : books) {
            if (book.getAuthor().equals(author)) {
                return book;
            }
        }
        return null;
    }

    public Book findBookByIsbn(String isbn) {
        for (Book book : books) {
            if (book.getIsbn().equals(isbn)) {
                return book;
            }
        }
        return null;
    }
}

3. 最后，可以编写一个简单的控制台程序来测试图书管理系统。可以使用以下代码实现：

import java.util.Scanner;

public class Main {
    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. 查找图书");
            System.out.println("4. 退出");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.println("请输入书名：");
                    String title = scanner.nextLine();
                    System.out.println("请输入作者：");
                    String author = scanner.nextLine();
                    System.out.println("请输入出版社：");
                    String publisher = scanner.nextLine();
                    System.out.println("请输入ISBN号：");
                    String isbn = scanner.nextLine();
                    Book book = new Book(title, author, publisher, isbn);
                    manager.addBook(book);
                    System.out.println("添加成功！");
                    break;
                case 2:
                    System.out.println("请输入书名：");
                    title = scanner.nextLine();
                    book = manager.findBookByTitle(title);
                    if (book != null) {
                        manager.removeBook(book);
                        System.out.println("删除成功！");
                    } else {
                        System.out.println("未找到该书！");
                    }
                    break;
                case 3:
                    System.out.println("请选择查找方式：");
                    System.out.println("1. 按书名查找");
                    System.out.println("2. 按作者查找");
                    System.out.println("3. 按ISBN号查找");
                    int searchChoice = scanner.nextInt();
                    scanner.nextLine();
                    switch (searchChoice) {
                        case 1:
                            System.out.println("请输入书名：");
                            title = scanner.nextLine();
                            book = manager.findBookByTitle(title);
                            if (book != null) {
                                System.out.println("书名：" + book.getTitle());
                                System.out.println("作者：" + book.getAuthor());
                                System.out.println("出版社：" + book.getPublisher());
                                System.out.println("ISBN号：" + book.getIsbn());
                            } else {
                                System.out.println("未找到该书！");
                            }
                            break;
                        case 2:
                            System.out.println("请输入作者：");
                            author = scanner.nextLine();
                            book = manager.findBookByAuthor(author);
                            if (book != null) {
                                System.out.println("书名：" + book.getTitle());
                                System.out.println("作者：" +