java edit file contents to uppercase

import java.io.*;

public class FileIO {
    public static void main (String[] args) throws IOException {
        // Create input stream
        FileReader fr = new FileReader("test.txt");
        BufferedReader in = new BufferedReader(fr);

        // Create output stream
        FileWriter fw = new FileWriter("out.txt");
        BufferedWriter out = new BufferedWriter(fw);

        boolean eof = false;
        int inChar;
        do {
            inChar = in.read();
            if (inChar != -1) {
                char outChar = Character.toUpperCase((char) inChar);
                out.write(outChar);
            } else
                eof = true;
            } while (!eof);
                in.close();
                out.close();
        }
    }