Creatng PDF files from java code [without using iText]

Creatng PDF files from java code [without using iText]

I want to create a PDF file from java code. And this is what I have
written so far-
public class IOExp {
public static void main(String args[]) throws java.io.IOException {
java.io.FileOutputStream fout=new
java.io.FileOutputStream("MyFile.pdf");
byte [] arr=("Hello World.\n"+"My name is Prateek Mathur, and I am
a great programmer.\n").getBytes();
fout.write(arr);
}
}
MyFile.pdf gets created without any problem, but on opening it, Adobe
Reader displays the following message-
'Abode Reader can not open 'MyFile.pdf' because it is either not a
supported file
type or because the file has been damaged (for example, it was sent as an
email
attachment and wasn't correctly decoded.'
I am already familier with iText API, and want to know how to create PDF
files manually.
What is the problem with my code, and what changes need to be introduced
to successfully create the PDF file??
Thank You very much in advance...