网上书店系统java代码

网上书店系统是一个基于Java开发的在线书店系统。下面是一个简单的示例代码，用于实现网上书店的基本功能：

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

public class OnlineBookStore {
    private List<Book> books;

    public OnlineBookStore() {
        books = new ArrayList<>();
    }

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

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

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

    public static void main(String[] args) {
        OnlineBookStore bookStore = new OnlineBookStore();
        Book book1 = new Book("Java Programming", "John Smith");
        Book book2 = new Book("Introduction to Python", "Jane Doe");
        Book book3 = new Book("Data Structures in C", "David Williams");

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

        List<Book> searchResult = bookStore.searchBook("Java");

        for (Book book : searchResult) {
            System.out.println(book.getTitle() + " by " + book.getAuthor());
        }
    }
}

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;
    }
}

上述代码中，OnlineBookStore类实现了网上书店的主要功能，包括添加书籍、移除书籍和搜索书籍。Book类表示一本书的信息，包括书名和作者。在main方法中，演示了添加几本书，然后搜索包含关键字"Java"的书籍，并打印搜索结果。

当然，这只是一个简单的示例代码，真实的网上书店系统还需要实现更多功能，如用户登录、购买图书、管理订单等。