isSolved method

public class Game{

  public static final int MAX_MISSES = 7;
  private String mAnswer;  
  private String mHits;
  private String mMisses;

public Game(String answer){

  mAnswer = answer;
  mHits = "";
  mMisses = "";

  }

  private char validateGuess(char letter) {

    if (! Character.isLetter(letter)) {
      throw new IllegalArgumentException("A letter is required"); 
    }
    letter = Character.toLowerCase(letter); 
    if (mMisses.indexOf(letter) >= 0 || mHits.indexOf(letter) >= 0){
    throw new IllegalArgumentException(letter + " has already been guessed"); 
    }
    return letter;
  }

 public boolean applyGuess(String letters) {
    if(letters.length() == 0) {
       throw new IllegalArgumentException("No letter found");
    }
    if(letters.length() >= 2){
      throw new IllegalArgumentException("Please enter one letter at a time to  guess your word");
    }
    //char firstLetter = letters.charAt(0);
    //return applyGuess(firstLetter);
    return applyGuess(letters.charAt(0));
   }

   public boolean applyGuess(char letter) {
      letter = validateGuess(letter);
      boolean isHit = mAnswer.indexOf(letter) >= 0;

      if(isHit) {
        mHits += letter;
       } else {
       mMisses += letter;
       }
       return isHit;
     }

     public String getCurrentProgress() {
           String progress = "";
           for (char letter : mAnswer.toCharArray()) {
           char display = '_';
           if(mHits.indexOf(letter) >= 0) {
              display = letter;
           }
           progress += display;
           }
           return progress;
       }

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

       public boolean isSolved() {

        //We are using a chaining method here: we already have a method that's keeping track of our current progress, which getCurrentProgress and it returns a String (---- if it's not completed and letters that have already hit will be revealed). we use this method and apply chaining method, i.e calling another method on the result returned by this method. -1 means check to see if there are no dashes in the returned string anymore..
            return getCurrentProgress().indexOf('-') == -1;
         }

          public String getAnswer() {

             return mAnswer;
           }

     }

import java.io.Console;

public class Prompter{

  private Game mGame;

  public Prompter(Game game){

    mGame = game;

  }

  public void play() {

    while (mGame.getRemainingTries() > 0 && !mGame.isSolved()) {
    displayProgress();
    promptForGuess();

    }
    gameResult();
  }

  public void gameResult(){
    if (mGame.isSolved()) {
    System.out.printf("Congratulations you won with %d tries remaining!\n",  
                    mGame.getRemainingTries()); 
    } else {
      System.out.printf("Bummer the word was %s. :(\n", mGame.getAnswer());
    }
  }

   public boolean promptForGuess() {
      Console console = System.console();
      boolean isHit = false;
      boolean isValidGuess = false;
        while (! isValidGuess) {
        String guessAsString = console.readLine("Enter a letter: ");
        //char guess = guessAsString.charAt(0);
        try {
         isHit = mGame.applyGuess(guessAsString);
         isValidGuess = true;
        } catch (IllegalArgumentException iae) {
          System.out.printf("%s. Please try again.\n",iae.getMessage()); 
        }
     }
        return isHit;
     }

     public void displayProgress() {
        System.out.printf("You have %d tries left to solve:  %s\n",        mGame.getRemainingTries(), mGame.getCurrentProgress()); 
     }

  }

public class Hangman {

  public static void main(String[] args) {
    // Enter amazing code here:
    Game game = new Game("treehouse");
    Prompter prompter = new Prompter(game); 
    prompter.play();
  }

 }