fro

  import java.io.File;
    import java.util.Scanner;
    
    public class fro
    {
        
        public static void main( String[] args ) throws Exception {
            
            Scanner keyboard = new Scanner(System.in);
            
            String file;
            int number1, number2, number3, sum;
            
            System.out.print( "Which file would you like to read numbers from: " );
            file = keyboard.next();
            System.out.println( "Reading numbers from file \"" + file + "\"" );
            System.out.println();
            
            Scanner numbers = new Scanner( new File(file));
            number1 = numbers.nextInt();
            number2 = numbers.nextInt();
            number3 = numbers.nextInt();
            
            numbers.close();
            
            sum = number1 + number2 + number3;
            System.out.println( number1 + " + " + number2 + " + " + number3 + " = " + sum );
            
        }
    }
Picture of the output