Подскажите пожалуйста что не так?
package com.javarush.task.task18.task1820;
import java.io.*;
/*
Округление чисел
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String str1 = reader.readLine();
String str2 = reader.readLine();
// String str1= "C:/Users/user/Desktop/1.txt";
// String str2= "C:/Users/user/Desktop/2.txt";
reader.close();
BufferedReader br = new BufferedReader(new FileReader(str1));
BufferedWriter bw = new BufferedWriter(new FileWriter(str2));
String s;
while ((s = br.readLine()) != null) {
StringBuffer sb = new StringBuffer();
bw.write(String.valueOf(sb.append(Math.round(Double.parseDouble(s))).append(" ")));
}
br.close();
bw.close();
}
}