// File Input/Output Example

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

public class FileInputOutput {

    public static void main(String[] args) {

        int count = 1;
        try {

            // Open input stream
            Scanner scan = new Scanner(new File(args[0]));

            // Read contents
            while (scan.hasNextLine()) {

                // Read line
                String line = scan.nextLine();

                // Print line
                System.out.println(count + ": " + line);
                count++;
            }

            // Close input stream
            scan.close();

        } catch (IOException e) {
            System.out.println("Cannot read file: " + args[0]);
            System.exit(0);
        }

        // Open output file
        try {

            // Open output stream
            PrintWriter output = new PrintWriter(new File(args[1]));

            output.printf("Real number: %.2f\n", 123456.56789);
            output.println("Integer number: " + 987654);
            output.println("String variable: " + "Hello There");

            // Close output stream
            output.close();

        } catch (IOException e) {
            System.out.println("Cannot write file: " + args[1]);
            System.exit(0);
        }
    }
}