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;}@Overridepublic String toString() {return "Title: " + title + ", Author: " + author;}
}class Library {private ArrayList<Book> 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 newlineswitch (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。