Can anyone help me with that? Why String.replace doesn't work?
package pl.codegym.task.task19.task1909;
/*
Znaki parzyste
*/
import java.io.*;
import java.util.*;
public class Solution {
public static void main(String[] args) throws IOException{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
String fileName2 = reader.readLine();
reader.close();
BufferedReader fileReader = new BufferedReader(new FileReader(fileName));
BufferedWriter fileWriter = new BufferedWriter(new FileWriter(fileName2));
StringBuilder builder = new StringBuilder();
String s;
while (fileReader.ready()){
builder.append(fileReader.read());
}
s = builder.toString();
s.replace(".", "!");
fileWriter.write(s);
fileReader.close();
fileWriter.close();
}
}