JAVA字符串反轉的三種方法

方法一：使用StringBuilder

import java.util.Scanner;public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); System.out.println(new StringBuilder(str).reverse()); }}

方法二：使用循環

import java.util.Scanner;public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); char[] chars = str.toCharArray(); String reverse = ''; for (int i = chars.length - 1;i>=0;i--){ reverse += chars[i]; } System.out.println(reverse); }}

方法三：考慮到String不可變，使用StringBuilder

import java.util.Scanner;public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); char[] chars = str.toCharArray(); StringBuilder reverse = new StringBuilder(); for (int i = chars.length - 1;i>=0;i--){ reverse.append(chars[i]); } System.out.println(reverse); }}

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