用Java写一个图书借阅管理系统

好的，我可以为您提供一个简单的图书借阅管理系统的Java代码。这个系统包括以下功能：

1. 添加图书
2. 删除图书
3. 查询图书
4. 借阅图书
5. 归还图书

首先，我们需要定义一个`Book`类，用来表示一本图书的信息，例如书名、作者、出版社、ISBN等：

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

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

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public String getPublisher() {
        return publisher;
    }

    public String getIsbn() {
        return isbn;
    }

    public boolean isBorrowed() {
        return borrowed;
    }

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

然后，我们需要一个`Library`类，用来管理图书的借阅：

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

public class Library {
    private List<Book> books;

    public Library() {
        this.books = new ArrayList<>();
    }

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

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

    public List<Book> searchBooks(String keyword) {
        List<Book> result = new ArrayList<>();
        for (Book book : books) {
            if (book.getTitle().contains(keyword) || book.getAuthor().contains(keyword) || book.getPublisher().contains(keyword) || book.getIsbn().contains(keyword)) {
                result.add(book);
            }
        }
        return result;
    }

    public void borrowBook(Book book) {
        if (!book.isBorrowed()) {
            book.setBorrowed(true);
        } else {
            System.out.println("This book is already borrowed.");
        }
    }

    public void returnBook(Book book) {
        if (book.isBorrowed()) {
            book.setBorrowed(false);
        } else {
            System.out.println("This book is not borrowed.");
        }
    }
}

最后，我们可以编写一个`Main`类，用来测试上面的代码：

import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Library library = new Library();

        Book book1 = new Book("Java Tutorial", "John Smith", "Oracle", "1234567890");
        Book book2 = new Book("Python for Beginners", "Jane Doe", "O'Reilly Media", "0987654321");
        Book book3 = new Book("JavaScript Cookbook", "Bob Johnson", "Wiley", "1357908642");

        library.addBook(book1);
        library.addBook(book2);
        library.addBook(book3);

        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("Welcome to the Library Management System!");
            System.out.println("1. Add book");
            System.out.println("2. Remove book");
            System.out.println("3. Search book");
            System.out.println("4. Borrow book");
            System.out.println("5. Return book");
            System.out.println("0. Exit");
            System.out.print("Please enter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine();
            switch (choice) {
                case 1:
                    System.out.print("Please enter the title of the book: ");
                    String title = scanner.nextLine();
                    System.out.print("Please enter the author of the book: ");
                    String author = scanner.nextLine();
                    System.out.print("Please enter the publisher of the book: ");
                    String publisher = scanner.nextLine();
                    System.out.print("Please enter the ISBN of the book: ");
                    String isbn = scanner.nextLine();
                    Book book = new Book(title, author, publisher, isbn);
                    library.addBook(book);
                    System.out.println("Book added successfully.");
                    break;
                case 2:
                    System.out.print("Please enter the ISBN of the book: ");
                    isbn = scanner.nextLine();
                    List<Book> searchResult = library.searchBooks(isbn);
                    if (searchResult.size() == 1) {
                        Book bookToRemove = searchResult.get(0);
                        library.removeBook(bookToRemove);
                        System.out.println("Book removed successfully.");
                    } else {
                        System.out.println("Book not found.");
                    }
                    break;
                case 3:
                    System.out.print("Please enter the keyword to search: ");
                    String keyword = scanner.nextLine();
                    List<Book> searchResult2 = library.searchBooks(keyword);
                    if (searchResult2.size() > 0) {
                        System.out.println("Search result:");
                        for (Book b : searchResult2) {
                            System.out.println(b.getTitle() + " by " + b.getAuthor() + " (" + b.getPublisher() + ", " + b.getIsbn() + ")");
                        }
                    } else {
                        System.out.println("No book found.");
                    }
                    break;
                case 4:
                    System.out.print("Please enter the ISBN of the book: ");
                    isbn = scanner.nextLine();
                    List<Book> searchResult3 = library.searchBooks(isbn);
                    if (searchResult3.size() == 1) {
                        Book bookToBorrow = searchResult3.get(0);
                        library.borrowBook(bookToBorrow);
                        System.out.println("Book borrowed successfully.");
                    } else {
                        System.out.println("Book not found.");
                    }
                    break;
                case 5:
                    System.out.print("Please enter the ISBN of the book: ");
                    isbn = scanner.nextLine();
                    List<Book> searchResult4 = library.searchBooks(isbn);
                    if (searchResult4.size() == 1) {
                        Book bookToReturn = searchResult4.get(0);
                        library.returnBook(bookToReturn);
                        System.out.println("Book returned successfully.");
                    } else {
                        System.out.println("Book not found.");
                    }
                    break;
                case 0:
                    System.out.println("Goodbye!");
                    return;
                default:
                    System.out.println("Invalid choice.");
                    break;
            }
            System.out.println();
        }
    }
}

这是一个简单的图书借阅管理系统，您可以根据需要进行修改和扩展。