如何反转字符串？

访客 python案例 2026-06-06 07:45:35 5

本文目录导读：

Python
JavaScript
Java
C++
C
Go
注意事项

在编程中，反转字符串有多种方法，具体取决于你使用的编程语言,以下是几种常见语言的反转字符串实现：

Python

# 方法1：切片
s = "hello"
reversed_s = s[::-1]
print(reversed_s)  # "olleh"
# 方法2：使用内置函数
s = "hello"
reversed_s = ''.join(reversed(s))
print(reversed_s)  # "olleh"
# 方法3：循环
s = "hello"
reversed_s = ''
for char in s:
    reversed_s = char + reversed_s
print(reversed_s)  # "olleh"

JavaScript

// 方法1：字符串转数组再反转
let s = "hello";
let reversed_s = s.split('').reverse().join('');
console.log(reversed_s);  // "olleh"
// 方法2：使用扩展运算符
let s = "hello";
let reversed_s = [...s].reverse().join('');
console.log(reversed_s);  // "olleh"
// 方法3：循环
let s = "hello";
let reversed_s = '';
for (let i = s.length - 1; i >= 0; i--) {
    reversed_s += s[i];
}
console.log(reversed_s);  // "olleh"

Java

// 方法1：使用StringBuilder
String s = "hello";
String reversed_s = new StringBuilder(s).reverse().toString();
System.out.println(reversed_s);  // "olleh"
// 方法2：转换为字符数组
String s = "hello";
char[] charArray = s.toCharArray();
int left = 0, right = s.length() - 1;
while (left < right) {
    char temp = charArray[left];
    charArray[left] = charArray[right];
    charArray[right] = temp;
    left++;
    right--;
}
String reversed_s = new String(charArray);
System.out.println(reversed_s);  // "olleh"

C++

#include <iostream>
#include <algorithm>
#include <string>
int main() {
    std::string s = "hello";
    // 方法1：使用reverse函数
    std::string reversed_s = s;
    std::reverse(reversed_s.begin(), reversed_s.end());
    std::cout << reversed_s << std::endl;  // "olleh"
    // 方法2：手动反转
    std::string reversed_s2;
    for (int i = s.length() - 1; i >= 0; i--) {
        reversed_s2 += s[i];
    }
    std::cout << reversed_s2 << std::endl;  // "olleh"
    return 0;
}

C

// 方法1：转换为字符数组
string s = "hello";
char[] charArray = s.ToCharArray();
Array.Reverse(charArray);
string reversed_s = new string(charArray);
Console.WriteLine(reversed_s);  // "olleh"
// 方法2：使用LINQ
string s = "hello";
string reversed_s = new string(s.Reverse().ToArray());
Console.WriteLine(reversed_s);  // "olleh"

Go

package main
import "fmt"
func reverseString(s string) string {
    runes := []rune(s)
    for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
        runes[i], runes[j] = runes[j], runes[i]
    }
    return string(runes)
}
func main() {
    s := "hello"
    reversed_s := reverseString(s)
    fmt.Println(reversed_s)  // "olleh"
}