Write to File

package StreamsFilesAndDirectories4;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.*;

public class WriteToFile {
    public static void main(String[] args) throws IOException {

        String pathIn = "input.txt";
        String pathOut = "output.txt";

        Set<Character> forbiddenSymbols = new HashSet<>();
        Collections.addAll(forbiddenSymbols, '.', ',', '!', '?');

       try (FileInputStream in = new FileInputStream(pathIn);
            FileOutputStream out = new FileOutputStream(pathOut)) {

           int oneByte = in.read();
           while (oneByte >= 0) {
               char myByteAsChar = (char) oneByte;
               if (!forbiddenSymbols.contains(myByteAsChar)) {
                   out.write(oneByte);
               }
               oneByte = in.read();
           }
       } catch (IOException e){
           throw  new RuntimeException(e);
       }
    }
}