inputValidationHelp

package calculateaveragegrade;

import java.util.Scanner;

/**
 *
 * @author Tolfasn
 */
public class CalculateAverageGrade {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

      Scanner keyboard = new Scanner(System.in);

      double score1;
      double score2;
      double score3;
      double score4;
      double score5;
      double scoreAvg;


        System.out.print("Please enter your First score: ");
                score1 = getInput();
                        System.out.println("1st Score: "
                        + score1 + "\t" + determineGrade(score1));

        System.out.print("Second score: ");
                score2 = getInput();
                        System.out.println("2nd Score: "
                        + score2 + "\t" + determineGrade(score2));

        System.out.print("Third score: ");
                score3 = getInput();
                        System.out.println("3rd Score: "
                        + score3 + "\t" + determineGrade(score3));

        System.out.print("Fourth score: ");
                score4 = getInput();
                        System.out.println("4th Score: "
                        + score4 + "\t" + determineGrade(score4));

        System.out.print("Fifth score: ");
                score5 = getInput();
                        System.out.println("5th Score: "
                        + score5 + "\t" + determineGrade(score5));

        System.out.println("\nAverage score: "
        + calcAverage(score1, score2, score3, score4, score5));
        System.out.println("Your average grade is " + determineGrade
        (calcAverage(score1, score2, score3, score4, score5)));
    }

    private static String determineGrade(double grade)
    {
      //
      String letterGrade;

        if (grade >= 90 && grade <= 100)
           letterGrade = "  A\n";
        else if (grade >= 80 && grade <= 89)
           letterGrade = "  B\n";
        else if (grade >= 70 && grade <= 79)
           letterGrade = "  C\n";
        else if (grade >= 60 && grade <= 69)
           letterGrade = "  D\n";
        else
            letterGrade = "  F\n";

      return letterGrade;
    }

    private static double calcAverage (double score1, double score2,
            double score3, double score4, double score5)
    {
        double scoreAvg;

        scoreAvg = (score1 + score2 + score3 + score4 + score5) / 5.0;

        return scoreAvg;
    }

    // get and validate input here.
    private static double getInput(){

    //Set validInput to true if your input is good.
    Scanner keyboard = new Scanner(System.in);
    Boolean validInput = false;
    double input = keyboard.nextDouble();

        if(input >= 1 && input <= 100)
            return input;
        else
            System.out.println("Please enter a value between 1-100: ");
                input = getInput();
                return input;
    }
}