помогите
package com.javarush.task.task19.task1925;
import java.io.*;
import java.util.ArrayList;
import java.util.StringJoiner;
/*
Длинные слова
*/
public class Solution {
public static void main(String[] args) throws IOException {
FileReader fileReader = new FileReader(args[0]);
FileWriter fileWriter = new FileWriter(args[1]);
String line ="" ;
while (fileReader.ready())
{
int a = fileReader.read();
line += String.valueOf((char) a);
}
fileReader.close();
line=line.replaceAll("\\n","");
String[] mass = line.split("\\s");
StringJoiner joiner = new StringJoiner(",");
for(int i=0; i< mass.length;i++){
if(mass[i].length()>6)
joiner.add(mass[i]);
}
fileWriter.write(joiner.toString());
fileWriter.close();
}
}