题解 | 数字颠倒

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 scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        System.out.println(reverseNumberToString(num));
    }

    private static String reverseNumberToString(int num) {
        String numStr=Integer.toString(num);
        String reversedStr=new StringBuilder(numStr).reverse().toString();
        return reversedStr;
    }
}