题解 | #字符逆序#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        char[] chars = str.toCharArray();
        for (int i = 0, j = chars.length - 1; i < chars.length / 2; i++, j--) {
            char charTemp;
            charTemp = chars[i];
            chars[i] = chars[j];
            chars[j] = charTemp;

        }
        String strReverse = new String(chars);
        System.out.print(strReverse);
    }
}