Подскажите, где ошибка
package com.javarush.task.task18.task1826;
/*
Шифровка
*/
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class Solution {
public static void main(String[] args) throws Exception{
FileInputStream fis = new FileInputStream(args[1]);
FileOutputStream fos = new FileOutputStream(args[2]);
byte[] buffer = new byte[fis.available()];
if (args[0].equals("-e")) {
fos.write(fis.read(buffer) + 1);
}
if (args[0].equals("-d")) {
fos.write(fis.read(buffer) - 1);
}
fis.close();
fos.close();
}
}
//"-e"
//fileWrite.write(fileRead.read() + 1);
//"-d"
//fileWrite.write(fileRead.read() - 1);