Java issue

import java.util.*;

interface I_GG {
   final int MIN_NUMBER = 1;
   final int MAX_NUMBER = 205;
   final int BACKDOOR_NUMBER = -314;
   final int DFLT_NUMBER = 60;
   final int WON_VALUE = 0;
   final int QUIT_VALUE = -1;
   final int LOSE_VALUE = -2;
   int MAX_GAMES = 4;
   final int MAX_GUESSES = 10;
   int HINT_THRESHOLD = 5;
   char NO = 'n', NO_UPPER = 'N';
   char YES = 'y', YES_UPPER = 'Y';

   String NOPE_MSG = "nope...";
   String NOPE_NOPE_MSG = "you've already guessed that wrong guess...";
   String INVALID_INPUT_BEGIN = "*** invalid input -- ";
   String INPUT_TOO_LOW_MSG = INVALID_INPUT_BEGIN + "must be greater than " +
                              (MIN_NUMBER - 1);
   String INPUT_TOO_HIGH_MSG = INVALID_INPUT_BEGIN + "must be less than " +
                               (MAX_NUMBER + 1);
   String INPUT_NOT_INT_MSG = INVALID_INPUT_BEGIN + "must be an whole number";
   String NOT_YN_MSG = INVALID_INPUT_BEGIN + "must be " + NO + " or " + YES;
   String WINNER_MSG = "you're a winner... # of guesses: ";
   String LOSER_MSG = "too many guesses entered... the number was ";
   String QUITTER_MSG = "you're a quitter... the number was ";
   String MAX_GAMES_PLAYED_MSG = "\nMaximum number (" + MAX_GAMES +
                                 ") of games played.";
   String ENTER_GUESS_PROMPT = "enter a guess between " + MIN_NUMBER +
                               " and " + MAX_NUMBER + " (" + QUIT_VALUE +
                               " to quit): ";
   String PLAY_AGAIN_PROMPT = "\nDo you want to play again (" + NO +
                              " or " + YES + ")? ";

   String BOLD_BEGIN = "*** ";
   String BOLD_END = " ***";
   String PLAY_MSG = " playing the CSC205AA" + " guessing game." + BOLD_END;
   String WELCOME_MSG = BOLD_BEGIN + "Hello! Have fun" + PLAY_MSG;
   String THANKS_MSG = BOLD_BEGIN + "Thanks for" + PLAY_MSG;
   String GUESSES_DUMP = "...guesses in ascending order: ";
   String WINNER_RESULT = "Won";
   String QUITTER_RESULT = "Quit";
   String LOSER_RESULT = "Lost";
   // printf() format strings...
   String GAME_STATS_FMT = "games played: %d; won: %d; lost: %d; quit: %d;" +
                           " winning pct.: %.2f%%\n";
   String GAME_DUMP_FMT = "game %d: %s; the number was: %d; " +
                      "#guesses: %d; backdoored: %s\n";
}

public class GuessingGame
{
    public static void main(String[] argv)
    {
        Random rand = new Random(System.nanoTime());
        Scanner scanner = new Scanner(System.in);
        int numberToGuess = rand.nextInt(I_GG.MAX_NUMBER - I_GG.MIN_NUMBER) + I_GG.MIN_NUMBER;
        int numberOfTries = 0;
        int Wins = 0;
        int inputGuess = 0;
        int previousGuess = 0;
        boolean previousGuessSame = false;

        System.out.println(I_GG.WELCOME_MSG);
        while(true)
        {

            numberOfTries = 0;
            while (numberOfTries < I_GG.MAX_GUESSES)
            {
                System.out.println(I_GG.ENTER_GUESS_PROMPT + "The number of guesses is: " + numberOfTries);
                inputGuess = scanner.nextInt();
                if(numberOfTries > 1)
                {
                    previousGuess = inputGuess;
                }
                if (inputGuess < 1 || inputGuess > 205)
                {
                    if(inputGuess == I_GG.QUIT_VALUE)
                    {
                        break;
                    }
                    else if(inputGuess == I_GG.BACKDOOR_NUMBER)
                    {
                        System.out.println("... number is " + numberToGuess);
                    }else
                    {
                        System.out.println("*** invalid input -- must be greater than " + (I_GG.MIN_NUMBER - I_GG.MIN_NUMBER)
                                + " and must be less than " + (I_GG.MAX_NUMBER + I_GG.MIN_NUMBER + " ***"));
                    }
                }
                else if (inputGuess == numberToGuess)
                {
                    System.out.println(I_GG.WINNER_MSG + numberOfTries);
                }
                else if (inputGuess != numberToGuess && numberOfTries >= I_GG.HINT_THRESHOLD)
                {
                    if(inputGuess < numberToGuess)
                    {
                        System.out.println(I_GG.INPUT_TOO_LOW_MSG);
                    }
                    else
                    {
                        System.out.println(I_GG.INPUT_TOO_HIGH_MSG);
                    }
                }
                else if (inputGuess == previousGuess)
                {
                System.out.println(I_GG.NOPE_NOPE_MSG);
                }
                else
                {
                    System.out.println(I_GG.NOPE_MSG);
                }
                numberOfTries = numberOfTries++;

            }

            System.out.println(I_GG.PLAY_AGAIN_PROMPT);
            //char c = scanner.next().trim().charAt(0);

            //if(c)


            //if(scanner.next() == I_GG. || scanner.next() == I_GG.NO_UPPER)
            //{
            //  break;
            //}
        }
    }
}