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;'>// 添加圖書
public void addBook() {
    System.out.print("輸入書名：");
    String title = scanner.nextLine();
    System.out.print("輸入作者：");
    String author = scanner.nextLine();
    System.out.print("輸入ISBN：");
    String isbn = scanner.nextLine();
    books.add(new Book(title, author, isbn));
    System.out.println("圖書添加成功！");
}

// 查找圖書（按書名或作者）
public void searchBook() {
    System.out.print("輸入要查找的關(guān)鍵詞（書名或作者）：");
    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("未找到相關(guān)圖書。");
    }
}

// 顯示所有圖書
public void displayAllBooks() {
    if (books.isEmpty()) {
        System.out.println("圖書館暫無(wú)圖書。");
        return;
    }
    for (Book book : books) {
        System.out.println(book);
    }
}

// 借閱圖書
public void borrowBook() {
    System.out.print("輸入要借閱的ISBN：");
    String isbn = scanner.nextLine();
    for (Book book : books) {
        if (book.getIsbn().equals(isbn)) {
            if (!book.isBorrowed()) {
                book.setBorrowed(true);
                System.out.println("成功借閱：" + book.getTitle());
            } else {
                System.out.println("該書已被借出。");
            }
            return;
        }
    }
    System.out.println("未找到該ISBN的圖書。");
}

// 歸還圖書
public void returnBook() {
    System.out.print("輸入要?dú)w還的ISBN：");
    String isbn = scanner.nextLine();
    for (Book book : books) {
        if (book.getIsbn().equals(isbn)) {
            if (book.isBorrowed()) {
                book.setBorrowed(false);
                System.out.println("成功歸還：" + book.getTitle());
            } else {
                System.out.println("該書本未被借出。");
            }
            return;
        }
    }
    System.out.println("未找到該ISBN的圖書。");
}

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--- 圖書管理系統(tǒng) ---");
        System.out.println("1. 添加圖書");
        System.out.println("2. 查找圖書");
        System.out.println("3. 顯示所有圖書");
        System.out.println("4. 借閱圖書");
        System.out.println("5. 歸還圖書");
        System.out.println("6. 退出");
        System.out.print("請(qǐng)選擇操作：");

        choice = scanner.nextInt();
        scanner.nextLine(); // 消費(fèi)換行符

        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("退出系統(tǒng)。"); break;
            default: System.out.println("無(wú)效選擇，請(qǐng)重試。");
        }
    } while (choice != 6);

    scanner.close();
}