Problems with file writing.

My problem is that when I run a command, the command is supposed to write to a file. However, whenever the command is run, everything in the file is removed, and then it writes the data to the file. I don't understand why this is, but if anyone could help, I would be grateful. Here is the try/catch statement for the file writing:

Code:

try{
                    File f = new File("plugins/Origins/groups/guests.txt");
                    FileWriter fw = new FileWriter(f);
                    f.setWritable(true);
                    fw.append(player.getName() + "\r\n");
                    plugin.guests.add(player.getName());
                    fw.close();
                    server.broadcastMessage(ChatColor.WHITE + "Added player " + ChatColor.DARK_GRAY + player.getName() + ChatColor.WHITE + " to the guest group.");
                }
                catch(Exception e){
                    cs.sendMessage(ChatColor.RED + "Fatal Error. Tell a dev.");
                }

 

No idea, maybe try using a BufferedWriter instead? idk

 

Google for how to append to a file, thats what you want.

 

First, don't put everything into a try catch, because it makes everything slow. Just put the methods that really need the try and catch.
http://docs.oracle.com/javase/1.4.2...Writer.html#FileWriter(java.io.File, boolean)
maybe you try that