用Java语音开发一个图书馆系统

好的，下面是一个简单的图书馆系统的Java代码示例，包括书籍类（Book）、用户类（User）和图书馆类（Library）：

// 书籍类
class Book {
    private String title;
    private String author;
    private boolean isBorrowed;

    public Book(String title, String author) {
        this.title = title;
        this.author = author;
        this.isBorrowed = false;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public boolean isBorrowed() {
        return isBorrowed;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }
}

// 用户类
class User {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

// 图书馆类
class Library {
    private Book[] books;
    private User[] users;

    public Library(Book[] books, User[] users) {
        this.books = books;
        this.users = users;
    }

    public void listBooks() {
        System.out.println("当前可借书籍列表：");
        for (Book book : books) {
            if (!book.isBorrowed()) {
                System.out.println(book.getTitle() + " - " + book.getAuthor());
            }
        }
        System.out.println();
    }

    public void borrowBook(String title, User user) {
        for (Book book : books) {
            if (book.getTitle().equals(title) && !book.isBorrowed()) {
                book.setBorrowed(true);
                System.out.println(user.getName() + " 借阅了 " + book.getTitle());
                return;
            }
        }
        System.out.println("对不起，" + title + " 已被借出或不存在！");
    }

    public void returnBook(String title) {
        for (Book book : books) {
            if (book.getTitle().equals(title) && book.isBorrowed()) {
                book.setBorrowed(false);
                System.out.println("归还 " + book.getTitle() + " 成功！");
                return;
            }
        }
        System.out.println("对不起，" + title + " 不是本图书馆的书籍或未被借出！");
    }
}

// 测试
public class Main {
    public static void main(String[] args) {
        // 创建书籍列表
        Book book1 = new Book("Java入门", "张三");
        Book book2 = new Book("Java进阶", "李四");
        Book[] books = {book1, book2};

        // 创建用户列表
        User user1 = new User("Tom", 20);
        User user2 = new User("Jerry", 22);
        User[] users = {user1, user2};

        // 创建图书馆
        Library library = new Library(books, users);

        // 列出可借书籍
        library.listBooks();

        // Tom借阅Java进阶
        library.borrowBook("Java进阶", user1);

        // 列出可借书籍
        library.listBooks();

        // Jerry借阅Java入门
        library.borrowBook("Java入门", user2);

        // 列出可借书籍
        library.listBooks();

        // Tom还书Java进阶
        library.returnBook("Java进阶");

        // 列出可借书籍
        library.listBooks();
    }
}

这个图书馆系统包括了书籍类、用户类和图书馆类，可以实现列出可借书籍、借阅书籍和还书等功能。