代码片段仓库

import javax.mail.*;
import javax.mail.inet.*;

public class EmailSender {
    public static void sendEmail(String to, String from, String subject, String body) throws MessagingException {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.example.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        
        Session session = Session.getInstance(props, new javax.mail.Authenticator() {
            protected PasswordAuthenticator getPasswordAuthenticator() {
                return new PasswordAuthenticator("username", "password");
            }
        });
        
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipient(RecipientType.TO, new InternetAddress(to));
        message.setSubject(subject);
        message.setText(body);
        
        Transport.send(message);
    }
}

import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np

data = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
sns.heatmap(data, annot=True, fmt="d")
plt.show()

#include "nlohmann/json.hpp"
#include <iostream>
using namespace std;
using json = nlohmann::json;

int main() {
    string jsonStr = "\n    {\n      \"name\": \"John\",\n      \"age\": 30,\n      \"city\": \"New York\"\n    }\n";
    
    auto j = json::parse(jsonStr);
    
    cout << "Name: " << j["name"] << endl;
    cout << "Age: " << j["age"] << endl;
    cout << "City: " << j["city"] << endl;
    
    return 0;
}

public class SimpleServer {
    public static void main(String[] args) throws IOException {
        try (ServerSocket serverSocket = new ServerSocket(8080)) {
            System.out.println("Server listening on port 8080");
            
            while (true) {
                Socket clientSocket = serverSocket.accept();
                
                new Thread(() -> {
                    try (BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()))) {
                        String inputLine;
                        while ((inputLine = in.readLine()) != null) {
                            out.write("Echo: " + inputLine);
                            out.newLine();
                            out.flush();
                        }
                    } finally {
                        clientSocket.close();
                    }
                }).start();
            }
        }
    }
}

#include <catch2/catch.hpp>

int add(int a, int b) {
    return a + b;
}

�CATCH_TEST("Add function", "[add]") {
    REQUIRE(add(1, 1) == 2);
    REQUIRE(add(2, 3) == 5);
}

import asyncio
import aiohttp

async def fetch_url(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as resp:
            return await resp.text()

async def main():
    urls3 = [
        'http://example.com',
        'http://example.org',
        'http://example.net'
    ]
    
    tasks = [fetch_url(url) for url in urls]
    results = await asyncio.gather(*tasks)
    
    for result in results:
        print(len(result))

asyncio.run(main())