题解 | #数字颠倒#

import java.util.*;

// 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);
        try {
            Integer a = in.nextInt();
            List list = new ArrayList<>();
            if (a == 0) {
                list.add(0);
            } else {
                while (a > 0) {
                    int b = a % 10;
                    a = a / 10;
                    list.add(b);
                }

            }
            Iterator  result = list.iterator();
            while (result.hasNext()) {
                System.out.print(result.next());
            }
        } catch (InputMismatchException e) {
            System.out.print("你输入的数据有误！");
        } finally {
            if (in != null) {
                in.close();
            }
        }
    }
}