How to use Character.toUpperCase(c) method in below program?

Question

Dear,
I have a source code as below. I want to ask how to convert all lower case letters in input file(farrago.txt) to upper case letters in the output file(outagain.txt)? Where the method Character.toUpperCase(c) adds into the code?
Please help!
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();
}

Answer 1

Sorry, i did not see that c is an int, so do it like this
while ((c = in.read()) != -1)
    char C  = Character.toUpperCase((char)c);
    out.write(C);
}Noah