Problems on saving a binary file

Question

Hi,
I have a String object that I need to save on disk, in binary format, for a database implementation project. I am using the FileOutputStream class, like this:
FileOutputStream fos = new FileOutputStream("file.db");
byte[] arrayBytes = new byte[myStr.length()];
arrayBytes = myStr.getBytes();
fos.write(arrayBytes);
fos.close();
The problem is that it saves the string in text (ASCII) format. If I open the file in Notepad it displays all the characters of the string, in a readable format, as it were a .txt file.
I have some friends implementing the project in Delphi, using a class called "FileWriter". Their file is not readable in Notepad. If we try to open it in notepad, only some characters are readable, other are junk characters.
As my professor doesn't want the database file to be readable by an ASCII editor, what can I do to save my String in binary format, like "FileWriter" class in Delphi?
(he said I can't serialize the object to disk)
The strange thing is that the FileOutputStream class documentation says it writes raw bytes of data. If they are raw bytes, how can I read them in notepad?
It's confusing to me... Is there any solution for what I need?
Thanks for your time and help.
Leo Hyppolito.

Answer 1

Like I said - search around. Something simple is:public class XOR {
    public static void main (String[] args) {
        String s = "Hello";
        s = flip (s);
        System.out.println (s);
        s = flip (s);
        System.out.println (s);
    private static String flip (String s) {
        String flippedString = "";
        for (int i = 0; i < s.length (); i ++) {
            flippedString += flip (s.charAt (i));
        return flippedString;
    private static char flip (char c) {
        return (char) (c ^ 0x5678);
}Kind regards,
Levi