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.
All Strings in Java are Unicode, there is nothing you can do to change that. However, when you output the String you can will use a character set other than Unicode if for example the file uses big5 encoding. Have a look at the contructors of jav.io.OutputStreamWriter.