прокомментируйте почему не удаляет
package com.javarush.task.task19.task1908;
import java.io.*;
import java.util.ArrayList;
/*
Выделяем числа
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
String fileName1=reader.readLine();
String fileName2= reader.readLine();
reader.close();
try(BufferedReader br=new BufferedReader(new FileReader(fileName1));
BufferedWriter bw=new BufferedWriter(new FileWriter(fileName2))) {
String line;
while ((line=br.readLine()) !=null) {
String [] str=line.split(" ");
for (String s:str) {
if(s.startsWith("\\w")) {
String delete= s.replace(s,"");
bw.write(delete + " ");
}
else if(s.endsWith("\\w")) {
String delete= s.replace(s,"");
bw.write(delete + " ");
}
bw.write(s + " ");
}
}
}
catch (IOException e) {
}
}
}