用java编写图书管理系统

一个简单的图书管理系统通常包含图书的增加、删除、查询和显示等基本功能。

以下是一个用 Java 编写的简单图书管理系统的示例代码。

import java.util.ArrayList;
import java.util.Scanner;

class Book {
    private String title;
    private String author;

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

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    @Override
    public String toString() {
        return "Title: " + title + ", Author: " + author;
    }
}

class Library {
    private ArrayList books;

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

    public void addBook(Book book) {
        books.add(book);
        System.out.println("Book added successfully.");
    }

    public void removeBook(String title) {
        for (Book book : books) {
            if (book.getTitle().equalsIgnoreCase(title)) {
                books.remove(book);
                System.out.println("Book removed successfully.");
                return;
            }
        }
        System.out.println("Book not found.");
    }

    public void displayBooks() {
        if (books.isEmpty()) {
            System.out.println("No books in the library.");
        } else {
            System.out.println("Books in the library:");
            for (Book book : books) {
                System.out.println(book);
            }
        }
    }

    public Book findBook(String title) {
        for (Book book : books) {
            if (book.getTitle().equalsIgnoreCase(title)) {
                return book;
            }
        }
        return null;
    }
}

public class LibraryManagementSystem {
    public static void main(String[] args) {
        Library library = new Library();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("\nLibrary Management System");
            System.out.println("1. Add Book");
            System.out.println("2. Remove Book");
            System.out.println("3. Display Books");
            System.out.println("4. Find Book");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");

            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume newline

            switch (choice) {
                case 1:
                    System.out.print("Enter book title: ");
                    String title = scanner.nextLine();
                    System.out.print("Enter book author: ");
                    String author = scanner.nextLine();
                    Book newBook = new Book(title, author);
                    library.addBook(newBook);
                    break;

                case 2:
                    System.out.print("Enter book title to remove: ");
                    String titleToRemove = scanner.nextLine();
                    library.removeBook(titleToRemove);
                    break;

                case 3:
                    library.displayBooks();
                    break;

                case 4:
                    System.out.print("Enter book title to find: ");
                    String titleToFind = scanner.nextLine();
                    Book foundBook = library.findBook(titleToFind);
                    if (foundBook != null) {
                        System.out.println("Book found: " + foundBook);
                    } else {
                        System.out.println("Book not found.");
                    }
                    break;

                case 5:
                    System.out.println("Exiting the program.");
                    System.exit(0);

                default:
                    System.out.println("Invalid choice. Please enter a valid option.");
            }
        }
    }
}

这个简单的图书管理系统允许用户添加书籍、删除书籍、显示所有书籍以及查找书籍。用户可以通过输入选项的数字来执行相应的操作。这只是一个基本示例，实际的系统可能需要更多功能和更复杂的设计。