Appending an external text file

Hi everyone. I need a little help. I'm trying to append an external text file. I'm able to read it using the "in.readLine()" and "BufferedReader" commands but can't figure how to append it. The reason being is I'm trying to add new information to each new line. For example my ext. text file looks something like this:
Homer Simpson 3489 Evergreen Terrace Springfield
Marge Simpson 3489 Evergreen Terrace Springfield
Bart Simpson 3489 Evergreen Terrace Springfield
Please note that I'm not using a string tokenizer to read the text file. If someone could please give me an example to append information to each new line I would greatly appreciate it. Also please note that the text file is being read into a vector to hold the information. Thank you.

open the FileWriter or FileOutputStream you use in "append" mode..
http://java.sun.com/j2se/1.4.1/docs/api/java/io/FileOutputStream.html
FileOutputStream(String name, boolean append)
          Creates an output file stream to write to the file
          with the specified name.http://java.sun.com/j2se/1.4.1/docs/api/java/io/FileWriter.html
FileWriter(String fileName, boolean append)
          Constructs a FileWriter object given a file name
          with a boolean indicating whether or not to append
          the data written.

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