[tpcode]
// Runnable code Demo:

public class NumberGuessingGameDemo {
    
    public static void main(String[] args) {
        java.util.Scanner myKB = new java.util.Scanner(System.in);
        System.out.println("            THE NUMBER GUESSING GAME");
        System.out.println("            ========================\n");

        int gamesPlayed = 0;
        boolean quit = false;
        while (!quit) {
            int allowableGuesses;
            boolean allowHighLowHints;
            gamesPlayed++;
            System.out.println("NEW GAME....#" + gamesPlayed + "\n");
            String guessesAllowable = "";
            while (guessesAllowable.isEmpty()) {
                System.out.println("A mystery number from 1 to 100 will be automatically");
                System.out.println("generated. How many guesses do you think it will take");
                System.out.print("you to guess this mystery number (q to quit)? --> ");
                guessesAllowable = myKB.nextLine().trim();
                if (!guessesAllowable.matches("\\d+|(?i)[q]")) {
                    System.out.println("Invalid Entry (" + guessesAllowable + ")! Try again...\n");
                    guessesAllowable = "";
                }
            }
            if (guessesAllowable.equalsIgnoreCase("q")) {
                System.out.println("\nGAME OVER - QUITING!");
                break;
            } else {
                allowableGuesses = Integer.parseInt(guessesAllowable);
            }
            System.out.println();

            // Does the User want Hints?
            String allowHintsYN = "";
            while (allowHintsYN.isEmpty()) {
                System.out.print("Want to enable Low/High hints (y/n)? -> ");
                allowHintsYN = myKB.nextLine().trim();
                if (!allowHintsYN.matches("(?i)[ynq]")) {
                    System.out.println("Invalid Entry (" + allowHintsYN + ")! Try again...\n");
                    allowHintsYN = "";
                }
            }
            if (allowHintsYN.equalsIgnoreCase("q")) {
                System.out.println("\nGAME OVER - QUITING!");
                break;
            } else {
                allowHighLowHints = (allowHintsYN.equalsIgnoreCase("y"));
            }
            
            java.util.Random r = new java.util.Random();
            int numberToGuess = r.nextInt(100) + 1;
            java.util.List<String> alreadyGuessed = new java.util.ArrayList<>();

            // System.out.println(numberToGuess);  // For testing...The random number to guess
            
            System.out.println();

            String guess = "";
            int guessCounter = 0;
            int guessesRemaining;
            while (guess.isEmpty()) {
                guessesRemaining = allowableGuesses - guessCounter;
                if (guessesRemaining == 0) {
                    System.out.println("\n           << GAME OVER  -  YOU LOSE >>");
                    System.out.println("You have run out of chances to guess the mystery number!");
                    System.out.println("The number you needed to guess was: " + numberToGuess + "\n");
                    break;
                }
                System.out.println("Guess a number between 1 and 100 (or q to quit).");
                System.out.print("You have " + guessesRemaining + " guesses remaining: --> ");
                guess = myKB.nextLine().trim();
                if (guess.matches("(?i)[q]")) {
                    System.out.println("Quitting this particular game!\n");
                    break;
                }
                guessCounter++;
                int guessedNum;
                if (guess.matches("-?\\d+")) {
                    guessedNum = Integer.parseInt(guess);
                } else {
                    System.out.println("Oh Oh...'" + guess + "' is not a number! That cost you one guess.\n");
                    guess = "";
                    continue;
                }
                if (alreadyGuessed.contains(guess)) {
                    System.out.println("Bad news...You already guessed '" + guess + "' previously!");
                    System.out.println("That cost you one guess. Try again...\n");
                    guess = "";
                    continue;
                } else {
                    alreadyGuessed.add(guess);
                }
                if (guessedNum == numberToGuess) {
                    System.out.println();
                    System.out.println("    << CONGRATULATIONS! YOU'RE A WINNER! >>");
                    System.out.println(guessedNum + " was the mystery number and you managed to guess");

                    System.out.println("that number in " + guessCounter
                            + (guessCounter == 1 ? " guess" : " guesses")
                            + " which is " + (guessCounter == allowableGuesses ? "what" : "below")
                            + " the allotted");
                    System.out.println(allowableGuesses + " guesses you said "
                            + "you could do it in.\n");
                    break;
                } else if (guessedNum < 1 || guessedNum > 100) {
                    System.out.println("Ha Ha Ha...Bad news friend, you have to pick a number between 1 and 100.");
                    System.out.println("Pay attention! That cost you one guess. Try again...\n");
                    guess = "";
                } else if (guessedNum > numberToGuess) {
                    System.out.println("Hard luck." 
                            +(allowHighLowHints ? " Your guess is a little too high." : " Incorrect!") 
                            + " Try again...\n");
                    guess = "";
                } else if (guessedNum < numberToGuess) {
                    System.out.println("Hard luck." 
                            +(allowHighLowHints ? " Your guess is a little too low." : " Incorrect!") 
                            + " Try again...\n");
                    guess = "";
                }
            }

            String playAgain = "";
            while (true) {
                System.out.println("<< Press ENTER to play again >>");
                System.out.println("<<       or q to quit        >>");
                playAgain = myKB.nextLine().trim();
                if (playAgain.equalsIgnoreCase("q") || playAgain.isEmpty()) {
                    break;
                }
            }
            if (playAgain.equalsIgnoreCase("q")) {
                quit = true;
            }
        }
    }
}
[/tpcode]