public void main() {
        String userInput;
        boolean done;
        Scanner keyboard = new Scanner(System.in);
        do {
            System.out.println("Welcome to Hangman!");
            System.out.println("Do you want to play?");
            userInput = keyboard.next();
            if (userInput == "Yes" || userInput == "yes" || userInput == "y" || userInput == "Y") {
                done = true;
            } else {
                done = false;
            }
            while (!done) {
              System.out.println(getDisguisedWord());
              System.out.println("Guess a letter: ");
              String guess = keyboard.next();
              makeGuess(guess);
              if (gameOver()) {
                  String ui;
                  System.out.println("Do you want to play again?");
                  ui = keyboard.next();
                  if (ui == "Yes" || ui == "yes" || ui == "Y" || ui == "y") {
                      done = true;
                  } else {
                      done = false;
                  }
              }
            }
        } while(done == false);
    }