are there lseek/seek, tell, etc. in Java?

When I open a file by

BufferedWriter bw =
new BufferedWriter(new FileWriter(new File("myfile")));

Where myfile is existed, I don't want to over write the
file from top, I want to do some lseek/seek (like C) first,
then it "tell (like C)" the position. Then I write in somewhere
in myfile

I only found append, and write methods in java.io.Writer class

Thank you very much in advance!