No idea how to resolve this task
package pl.codegym.task.task18.task1826;
/*
Szyfrowanie
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws IOException {
FileInputStream FIS = new FileInputStream(args[1]);
FileOutputStream FOS = new FileOutputStream(args[2]);
BufferedReader reader = new BufferedReader(new FileReader(args[1]));
BufferedWriter writer = new BufferedWriter(new FileWriter(args[2]));
switch(args[0]){
case "e":
while(FIS.available()>0){
int data = FIS.read();
FOS.write((char) data);
}
break;
case "d":
String line;
BufferedReader inReader = new BufferedReader(new InputStreamReader(new FileInputStream(args[1])));
while ((line=inReader.readLine())!=null){
writer.write(line);
}
break;
}
FIS.close();
FOS.close();
}
}