Question

Write a program called Copy that accepts the names of an input file and an output file on the command line and copies the contents of the input file to the output file, for example, csc$ java Copy infile.txt outfile.txt

java Program

Answer 1

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

public class Copy {

    public static void main(String[] args) {
        if (args.length == 2) {
            File file = new File(args[0]);
            try {
                Scanner fin = new Scanner(file);
                PrintWriter pw = new PrintWriter(args[1]);
                while (fin.hasNextLine()) {
                    pw.println(fin.nextLine());
                }
                fin.close();
                pw.close();
            } catch (FileNotFoundException e) {
                System.out.println(file.getAbsolutePath() + " is not found!");
            }
        } else {
            System.out.println("Please provide file names as command line arguments");
        }
    }
}