how to append in a file from beginning.

hello all,
i am doing some file related work at some point i want to append the file from the beginning but i don't know how to do this, please help.

i m using File Writer constructor with second argument true for appending in the file but it appends from the end of the file but i want to insert something at beginning of the file contents.
Thanks.

You can't, or at least not directly. File systems usually don't allow prepending, only appending. You'll need to use a temporary file as an intermediate solution. Write to the temporary file first, then delete the original file and rename the temporary file to the original file.