How to convert a text file in lower case to upper case?

Question

I've a beginner in java world and I just come through the tutorial in http://java.sun.com/docs/books/tutorial/essential/io/filestreams.html showing how to copy a text file:
import java.io.*;
public class Copy {
public static void main(String[] args) throws IOException {
     File inputFile = new File("farrago.txt");
     File outputFile = new File("outagain.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
while ((c = in.read()) != -1)
out.write(c);
in.close();
out.close();
And I would like to ask how to covert all lower case letters in input file to upper case letter in output file at the same time of copying.
I guess it'll be using Character.toUpperCase(c), but I don't know how to do it actually.
Any help would be much appreciated.

Answer 1

Hope this helps
import java.io.*;
public class Copy {
public static void main(String[] args) throws IOException {
File inputFile = new File("farrago.txt");
File outputFile = new File("outagain.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
BufferedReader buff = new BufferedReader(in);
String c;
while ((c = buff.readLine()) != null)
out.write(c.toUpperCase());
in.close();
out.close();
}