This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
If you want to append to a file, then you should use the FileWriter constructor with the parameter which specifies that. The constructor you chose always overwrites the data in the file, if it already exists.