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主流编程语言的「Hello World」代码示例

  • 2026-02-03 10:22:47
主流编程语言的「Hello World」代码示例

「Hello World」是每个程序员入门的第一个程序,代表着敲开编程世界的大门。下面整理了12种主流/常见开发语言的实现方式,代码简洁易读,附带新手友好的解释,适合公众号排版发布。

不同编程语言的Hello World代码展示

Python

Python 的 Hello World 是所有语言中最简洁的,无需复杂的语法结构,一行即可实现。

# 打印 Hello World(# 是Python的注释符号,不会执行)print("Hello, World!")
Java

Java 是面向对象语言,必须包裹在类中,结构更规范,注意大小写敏感。

// 定义公共类 HelloWorld(类名需与文件名一致)public class HelloWorld {    // 程序入口方法(固定写法)    publicstaticvoidmain(String[] args) {        // 控制台输出 Hello World        System.out.println("Hello, World!");    }}
C 语言

C语言是结构化编程的基础,需要引入标准输入输出库,有固定的程序入口。

// 引入标准输入输出头文件#include<stdio.h>// 主函数(程序入口)intmain(){    // 输出 Hello World    printf("Hello, World!\n");    // 程序正常结束返回0    return 0;}
C++

C++ 兼容C语言语法,也可使用C++特有的输出方式。

// 引入C++输入输出流头文件#include<iostream>// 使用标准命名空间(避免重复写std::)using namespace std;intmain(){    // C++风格输出    cout << "Hello, World!" << endl;    return 0;}
JavaScript

JavaScript 可运行在浏览器或Node.js环境,两种场景都适配。

<!-- 嵌入HTML中运行 --><!DOCTYPE html><html><body><script>    // 浏览器控制台输出    console.log("Hello, World!");    // 页面直接显示    document.write("Hello, World!");</script></body></html>
Go

Go语言简洁高效,内置丰富的标准库,语法接近C但更简洁。

// 声明主包(可执行程序必须是main包)package main// 引入fmt包(格式化输入输出)import "fmt"// 主函数funcmain() {    // 输出 Hello World    fmt.Println("Hello, World!")}
PHP

PHP 主要用于Web开发,可嵌入HTML,也可命令行运行。

<?php// 浏览器/终端输出echo "Hello, World!";// 换行(可选)echo "\n";?>
R

R语言专注于数据分析和可视化,入门第一个程序也很简单。

# 控制台输出 Hello Worldcat("Hello, World!")
Ruby

Ruby 以简洁优雅的语法著称,是Ruby on Rails框架的基础。

# 输出 Hello Worldputs "Hello, World!"
Swift

Swift 是苹果为iOS/macOS开发设计的语言,语法简洁现代。

// 输出 Hello World(print是Swift内置函数)print("Hello, World!")
HTML

虽然HTML不是编程语言(是标记语言),但新手常先接触,补充在此

<!DOCTYPE html><html><head>    <title>Hello World</title></head><body>    <!-- 页面显示 Hello World -->    <h1>Hello, World!</h1></body></html>
Shell

Shell脚本是Linux/UNIX系统管理的基础工具,语法简单直观。

#!/bin/bash# 输出 Hello Worldecho "Hello, World!"

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  1. CONNECT:[ UseTime:0.000769s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001601s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003230s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.015863s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001452s ]
  6. SELECT * FROM `set` [ RunTime:0.005699s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001844s ]
  8. SELECT * FROM `article` WHERE `id` = 462880 LIMIT 1 [ RunTime:0.008018s ]
  9. UPDATE `article` SET `lasttime` = 1770545074 WHERE `id` = 462880 [ RunTime:0.004491s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000708s ]
  11. SELECT * FROM `article` WHERE `id` < 462880 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011039s ]
  12. SELECT * FROM `article` WHERE `id` > 462880 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.049512s ]
  13. SELECT * FROM `article` WHERE `id` < 462880 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.147014s ]
  14. SELECT * FROM `article` WHERE `id` < 462880 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029472s ]
  15. SELECT * FROM `article` WHERE `id` < 462880 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.151589s ]
0.521727s