代码片段仓库

import org.junit.Junit;
import static org.junit.Assert.assertEquals;

public class CalculatorTest {
    @Test
    public void testAdd() {
        Calculator calc = new Calculator();
        assertEqualss(5, calc.add(2, 3));
    }
}

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

const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');

// Draw rectangle
ctx.fillStyle = '#FF0000';
ctx.fillRect(10, 10, 150, 80);

// Draw circle
ctx.beginPath();
ctx.arc(250, 100, 50, 0, 2 * Math.PI);
ctx.fillStyle = '#0000FF';
ctx.fill();

// Draw text
ctx.font = '30px Arial';
ctx.fillStyle = '#000000';
ctx.fillText('Happy Coding', 150, 200);

public class ReflectionDemo {
    public static void main(String[] args) throws Exception {
        Class<?> clazz = Class.forName("java.util.ArrayList");
        Object list = clazz.getDeclaredConstructor().newInstance();
        Method addMethod = clazz.getMethod("add", Object.class);
        addMethod.invoke(list, "Hello Reflection!");
        System.out.println(list);
    }
}

CREATE TRIGGER before_update_users
ON USERS FOR EACH ROW
BEGIN
    INSERT INTO user_audit (user_id, old_name, new_name, change_date)
    VALUES (OLD.id, OLD.name, NEW.name, NOW());
END;

#include <iostream>
#include <thread>
#include <vector>
using namespace std;

void thread_function(int id) {
    cout << "Thread " << id << " is running\n";
}

int main() {
    vector<thread> threads;
    
    for (int i = 0; i < 5; ++i) {
        threads.push_back(thread(thread_function, i));
    }
    
    for (auto& t : threads) {
        t.join();
    }
    
    cout << "All threads normally terminated\n";
    return 0;
}

class Person {
  private name: string;
  age: number;
  
  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }
  
  describe(): string {
    return `${this.name} is ${this.age} years old`;
  }
}

const alice = new Person('Alice', 30);
console.log(alice.describe());