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Java Java Objects Delivering the MVP Determining If the Game is Won

Andrew Chang
Andrew Chang
2,618 Points

Why isn't my code working? It keeps showing "enter a letter: "

public class Hangman{

  public static void main(String[] args){

    Game game = new Game("treehouse");
    Prompter prompter = new Prompter(game);
    while (game.getRemainingTries() > 0 && !game.isWon()){
class Game{
  public static final int MAX_MISSES = 7;
  private String answer;
  private String hits;
  private String misses;

  public String getAnswer(){
    return answer;

  public Game(String answer){
    this.answer = answer.toLowerCase();
    hits = "";
    misses = "";  

  private char normalizeGuess(char letter){
    if(! Character.isLetter(letter)){
      throw new IllegalArgumentException("A letter is required");
    letter = Character.toLowerCase(letter);
    if(misses.indexOf(letter) != -1 || hits.indexOf(letter) != -1){
      throw new IllegalArgumentException(letter+"has already been guesses");
    return letter;

    public boolean applyGuess(String letters){
      if(letters.length() == 0){
        throw new IllegalArgumentException("No letter found");
      return applyGuess(letters.charAt(0));

  public boolean applyGuess(char letter){
    letter = normalizeGuess(letter);
    boolean isHit = answer.indexOf(letter) != -1;
    if (isHit){
      hits += letter;
    } else{
      misses += letter; 
    return isHit;

  public int getRemainingTries() {
    return MAX_MISSES - misses.length();

  public String getCurrentProgress() {
    String progress = "";
    for(char letter : answer.toCharArray()) {
      char display = '-';
      if(hits.indexOf(letter) != -1){
        display = letter;
      progress += display;
    return progress;

  public boolean isWon(){
    return getCurrentProgress().indexOf('-') == -1;
import java.util.Scanner;

class Prompter{
  private Game game;

  public Prompter(Game game){
  this.game = game;

  public boolean promptForGuess(){
    Scanner scanner = new Scanner(System.in);
    boolean isHit = false;
    boolean isAcceptable = false;

        System.out.print("Enter a letter:   ");
        String guessInput = scanner.nextLine();

          isHit = game.applyGuess(guessInput);
          }catch(IllegalArgumentException iae){
          System.out.printf("%s. Please try again. %n",iae.getMessage());
      }while(! isAcceptable);
        return isHit;

  public void displayProgress(){
    System.out.printf("You have %d tries left to solve:   %s%n",

  public void displayOutcome(){
    System.out.printf("You won with %d tries remaining!%n",game.getRemainingTries());
      System.out.printf("Bummer! The word was %s.%n",game.getAnswer());

1 Answer

Teacher Russell
Teacher Russell
16,873 Points

The problem is in the Prompter class. We're missing a line of code in the try/catch block. Take a look. The Prompter class needs to know that the guess is acceptable.