code

public static double[] surfGrav(double[] plntGrav) //Find Gravity of Each Planet
    {
        Scanner inFile = new Scanner(new File("surfaceGravity.txt")); //Opens file from PlanetGravity

        //Empty Variables
        int index = 0;

        while(inFile.hasNext()) //Finds gravity of planets from PlanetGravity program
        {
            plntGrav[index] = inFile.nextDouble(); //ROOT OF PROBLEM i think.
            index++;
        }
        inFile.close();
        return plntGrav;
    }

    public static double[] plntWeight(double[] weights) //Find Mass & Weight
    {
        //Input
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter your weight in pounds.");
        double userWeight = in.nextDouble();

        //Empty Variables
        int index = 0;

        //Finds surfaceGrav
        double[] gravity = surfGrav();

        double userMass = (surfGrav(plntGrav[2]) * 453.59237); //Converts input from pounds to grams to find mass
        for(double gravit : gravity) //Finds user's weight on each individual planet
        {
            weights[index] = (userMass * gravit);
            index++;
        }
        return weights;
    }

    public static void main(String[] args) //Output info
    {
        String[] planets = {"Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"};

        //Finds weight
        double[] weight = plntWeight(weights);

        System.out.printf("%25s%n", "Planetary Data");
        System.out.println();
        System.out.printf("%8s%20f%18f%n", "Planet", "Gravity", "Weight (lbs)");
        System.out.println("============================================================================");
        for(int index = 0; index < planets.length; index++)
        {
            System.out.printf("%8s%20f%18f%n", planets[index], gravity[index], weight[index]);
        }
    }
}