File which is not human readable

Dear Friends,
I want to print some confidential characters and numbers in a file so that,
1. file will not be editable by any text editor such MS-DOS editor, Notepad or Wordpad etc..
2. file will not contain human readable characters
What file writer or reader classes shall I use ? and with what methods ?
Avijit

Use ObjectOutputStream...
from the java doc..
FileOutputStream ostream = new FileOutputStream("t.tmp");
     ObjectOutputStream p = new ObjectOutputStream(ostream);
     p.writeInt(12345);
     p.writeObject("Today");
     p.writeObject(new Date());
     p.flush();
     ostream.close();You can also encrypt the valuse before writing...
appu

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