如何使用Java实现图书管理系统的基本功能

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

// Getter 和 Setter 方法
public String getTitle() { return title; }
public String getAuthor() { return author; }
public String getIsbn() { return isbn; }
public boolean isBorrowed() { return isBorrowed; }
public void setBorrowed(boolean borrowed) { isBorrowed = borrowed; }

@Override
public String toString() {
    return "书名：" + title + " | 作者：" + author + " | ISBN：" + isbn + 
           " | 状态：" + (isBorrowed ? "已借出" : "可借阅");
}

import java.util.ArrayList;
import java.util.Scanner;
<p>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("输入书名：");
    String title = scanner.nextLine();
    System.out.print("输入作者：");
    String author = scanner.nextLine();
    System.out.print("输入ISBN：");
    String isbn = scanner.nextLine();
    books.add(new Book(title, author, isbn));
    System.out.println("图书添加成功！");
}

// 查找图书（按书名或作者）
public void searchBook() {
    System.out.print("输入要查找的关键词（书名或作者）：");
    String keyword = scanner.nextLine().toLowerCase();
    boolean found = false;
    for (Book book : books) {
        if (book.getTitle().toLowerCase().contains(keyword) ||
            book.getAuthor().toLowerCase().contains(keyword)) {
            System.out.println(book);
            found = true;
        }
    }
    if (!found) {
        System.out.println("未找到相关图书。");
    }
}

// 显示所有图书
public void displayAllBooks() {
    if (books.isEmpty()) {
        System.out.println("图书馆暂无图书。");
        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ISBN：");
    String isbn = scanner.nextLine();
    for (Book book : books) {
        if (book.getIsbn().equals(isbn)) {
            if (!book.isBorrowed()) {
                book.setBorrowed(true);
                System.out.println("成功借阅：" + book.getTitle());
            } else {
                System.out.println("该书已被借出。");
            }
            return;
        }
    }
    System.out.println("未找到该ISBN的图书。");
}

// 归还图书
public void returnBook() {
    System.out.print("输入要归还的ISBN：");
    String isbn = scanner.nextLine();
    for (Book book : books) {
        if (book.getIsbn().equals(isbn)) {
            if (book.isBorrowed()) {
                book.setBorrowed(false);
                System.out.println("成功归还：" + book.getTitle());
            } else {
                System.out.println("该书本未被借出。");
            }
            return;
        }
    }
    System.out.println("未找到该ISBN的图书。");
}

public class Main {
    public static void main(String[] args) {
        Library library = new Library();
        Scanner scanner = new Scanner(System.in);
        int choice;
<pre class='brush:java;toolbar:false;'>    do {
        System.out.println("\n--- 图书管理系统 ---");
        System.out.println("1. 添加图书");
        System.out.println("2. 查找图书");
        System.out.println("3. 显示所有图书");
        System.out.println("4. 借阅图书");
        System.out.println("5. 归还图书");
        System.out.println("6. 退出");
        System.out.print("请选择操作：");

        choice = scanner.nextInt();
        scanner.nextLine(); // 消费换行符

        switch (choice) {
            case 1: library.addBook(); break;
            case 2: library.searchBook(); break;
            case 3: library.displayAllBooks(); break;
            case 4: library.borrowBook(); break;
            case 5: library.returnBook(); break;
            case 6: System.out.println("退出系统。"); break;
            default: System.out.println("无效选择，请重试。");
        }
    } while (choice != 6);

    scanner.close();
}