Java中如何实现简单的图书管理程序

class Book {
    private String isbn;
    private String title;
    private String author;
    private boolean borrowed;
<pre class='brush:java;toolbar:false;'>public Book(String isbn, String title, String author) {
    this.isbn = isbn;
    this.title = title;
    this.author = author;
    this.borrowed = false;
}

public String getIsbn() {
    return isbn;
}

public String getTitle() {
    return title;
}

public String getAuthor() {
    return author;
}

public boolean isBorrowed() {
    return borrowed;
}

public void setBorrowed(boolean borrowed) {
    this.borrowed = borrowed;
}

<strong>@Override</strong>
public String toString() {
    return "ISBN: " + isbn + ", 书名: " + title + ", 作者: " + author + ", 状态: " + (borrowed ? "已借出" : "可借阅");
}

import java.util.ArrayList;
import java.util.Scanner;
<p>public class Library {
private ArrayList<Book> books = new ArrayList<>();
private Scanner scanner = new Scanner(System.in);</p><pre class='brush:java;toolbar:false;'>// 添加图书
public void addBook() {
    System.out.print("输入ISBN: ");
    String isbn = scanner.nextLine();
    System.out.print("输入书名: ");
    String title = scanner.nextLine();
    System.out.print("输入作者: ");
    String author = scanner.nextLine();
    books.add(new Book(isbn, title, author));
    System.out.println("图书添加成功！");
}

// 根据ISBN或书名查找图书
public Book findBook(String keyword) {
    for (Book book : books) {
        if (book.getIsbn().equals(keyword) || book.getTitle().contains(keyword)) {
            return book;
        }
    }
    return null;
}

// 显示所有图书
public void listBooks() {
    if (books.isEmpty()) {
        System.out.println("暂无图书记录。");
        return;
    }
    for (Book book : books) {
        System.out.println(book);
    }
}

// 借阅图书
public void borrowBook() {
    System.out.print("输入要借阅的图书ISBN或书名: ");
    String keyword = scanner.nextLine();
    Book book = findBook(keyword);
    if (book != null) {
        if (!book.isBorrowed()) {
            book.setBorrowed(true);
            System.out.println("借阅成功：" + book.getTitle());
        } else {
            System.out.println("该书已被借出。");
        }
    } else {
        System.out.println("未找到该图书。");
    }
}

// 归还图书
public void returnBook() {
    System.out.print("输入要归还的图书ISBN: ");
    String isbn = scanner.nextLine();
    Book book = findBook(isbn);
    if (book != null && book.isBorrowed()) {
        book.setBorrowed(false);
        System.out.println("归还成功：" + book.getTitle());
    } else {
        System.out.println("该书无需归还或未找到。");
    }
}

// 删除图书
public void removeBook() {
    System.out.print("输入要删除的图书ISBN: ");
    String isbn = scanner.nextLine();
    Book book = findBook(isbn);
    if (book != null) {
        books.remove(book);
        System.out.println("删除成功：" + book.getTitle());
    } else {
        System.out.println("未找到该图书。");
    }
}

// 主菜单
public void showMenu() {
    while (true) {
        System.out.println("\n--- 图书管理系统 ---");
        System.out.println("1. 添加图书");
        System.out.println("2. 查看所有图书");
        System.out.println("3. 借阅图书");
        System.out.println("4. 归还图书");
        System.out.println("5. 删除图书");
        System.out.println("6. 退出");
        System.out.print("请选择操作: ");
        String choice = scanner.nextLine();

        switch (choice) {
            case "1": addBook(); break;
            case "2": listBooks(); break;
            case "3": borrowBook(); break;
            case "4": returnBook(); break;
            case "5": removeBook(); break;
            case "6":
                System.out.println("退出系统。");
                return;
            default:
                System.out.println("无效选择，请重试。");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        new Library().showMenu();
    }
}