题解 | #字符串反转#

1、字符串构造器StringBuilder 来处理字符串

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.next();
        StringBuilder sb = new StringBuilder(str);
        sb = sb.reverse();
        System.out.println(sb.toString());
    }
}