Question

In Java code

Write a complete method name convertFile that accepts a File object representing an input text file and a PrintWriter objects as arguments. The method should read the contents of the input file and change all characters to uppercase and store the results in the output file.

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class ConvertFile {

    public static void convertFile(File file) {
        try {
            String result = "";
            Scanner fin = new Scanner(file);
            while (fin.hasNextLine()) {
                if (!result.isEmpty()) {
                    result += "\n";
                }
                result += fin.nextLine();
            }
            fin.close();

            PrintWriter pw = new PrintWriter(file);
            pw.println(result.toUpperCase());
            pw.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a file name: ");
        convertFile(new File(in.nextLine()));
    }
}