题解 | #数字颠倒#

import java.util.Scanner;

public class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        String s = String.valueOf(a);
        StringBuffer sb = new StringBuffer(s).reverse();
        System.out.println(sb);
    }
}

把int用String中的valueOf（）方法转换为String型，再由StringBuffer中的reverse翻转