As Rodrigo said above, each OS has it's own "New line" character. You should use System.getProperty("line.separator") to automatically get the appropriate line separator. The "\n" he is using probably isn't working because he is running his app. on a Windows system.
There is something wrong with that file you are reading, having \r\n in places and \n elsewhere. It looks as if it has been half written in Windows® and hal in Linux.
String.format("This is a String%n%s is brilliant%n", name); Or similar
Your \n worked on a JOptionPane dialogue on my Linux box.