题解 | #数字颠倒#

BufferedReader先读入，再用str.charAt()逆序输出

```import java.util.*;
import java.io.*;
public class Main{
    public static void main(String[] args)throws IOException{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String str=br.readLine();
        for(int i=str.length()-1;i>=0;i--){
            System.out.print(str.charAt(i));
        }
        br.close();
        }
    }