How to write new line in Java FileOutputStream

String lineSeparator = System.getProperty("line.separator");
<br>
fos.write(lineSeparator.getBytes());

To add a line break use

fileOutputStream.write(10);

here decimal value 10 represents newline in ASCII

It could be a viewer problem... Try opening the file in EditPlus or Notepad++. Windows Notepad may not recognise line feed of another operating system. In which program are you viewing the file now?

This should work. Probably you forgot to call encfileout.flush().

However this is not the preferred way to write texts. You should wrap your output stream with PrintWriter and enjoy its println() methods:

PrintWriter writer = new PrintWriter(new OutputStreamWriter(encfileout, charset));

Alternatively you can use FileWriter instead of FileOutputStream from the beginning:

FileWriter fw = new FileWriter("myfile");
PrintWriter writer = new PrintWriter(fw);

Now just call

writer.println();

And do not forget to call flush() and close() when you finish your job.