crypt/decrypt

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

        switch (args[0]) {
            case "-e" -> crypto(args[1], args[2]);
            case "-d" -> unCrypto(args[1], args[2]);
        }
    }
    public static void crypto(String firstFile,String secondFile) throws IOException {
        FileOutputStream fileOutputStreamE = new FileOutputStream(secondFile);
        for (Integer integer : getData(firstFile)) {
            fileOutputStreamE.write(integer+1);
        }
        fileOutputStreamE.close();
    }

    public static void unCrypto(String firstFile,String secondFile) throws IOException {
        FileOutputStream fileOutputStreamD = new FileOutputStream(secondFile);
        for (Integer integer : getData(firstFile )) {
            fileOutputStreamD.write(integer-1);
        }
        fileOutputStreamD.close();
    }
    public synchronized static ArrayList<Integer> getData(String firstFile) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(firstFile);
        ArrayList<Integer> list = new ArrayList<Integer>();
        while (fileInputStream.available()>0){
            list.add(fileInputStream.read());
        }
        fileInputStream.close();
        return list;

    }

}