import java.io.*;
import java.util.*;

public class ReadMultipleFiles {
  
  public static double sumFileContents(String path) throws FileNotFoundException {
    
    Scanner sc=null;

    try {
      File file = new File (path);
      sc = new Scanner(file);
      double double1 = sc.nextDouble();
      double double2 = sc.nextDouble();      
      return double1 + double2;
    }
    catch(NoSuchElementException ex) {
      System.out.println("The specified type of element was not found!");
    }
    finally {
      System.out.println("Closing File!");
      sc.close();
    }
    return 0.0;
  }
  
  public static double sumMultipleFileContents(String []args) throws FileNotFoundException {
    double sum;
    sum = sumFileContents(args[0]);
    for(int i=1; i<args.length; i++)
      sum += sumFileContents(args[i]);
    
    return sum;
  }
  
  public static void main(String args[]) {
    try {
      double result = sumMultipleFileContents(args);
      System.out.println("Result is: "+result);
    }
    catch(IndexOutOfBoundsException ex) {
      System.out.println("No file has been specified from command line!\n");
    }
    catch(FileNotFoundException ex) {
      System.out.println("One of the specified files was not found!");
    }
  }
}