Bash: hello : command not found - Java Hangman

public class Game {
    public static final int MAX_MISSES = 7;
    private String mAnswer; //What is a member variable?
    private String mHits;
    private String mMisses;

    public 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.");
            }
            return applyGuess(letters.charAt(0));
    }

    public Game(String answer) { 
        mAnswer = answer;
        mHits = "";
        mMisses = "";
    }

    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 String getAnswer() {
        return mAnswer;
    }

    public boolean isSolved() {
        return getCurrentProgress().indexOf('-') == -1;
    }
}

import java.io.Console;

public class Prompter {
    private Game mGame; //do we need to store?

    public Prompter(Game game) {
        mGame = game;
    }

    public void play() {
        while (mGame.getRemainingTries() > 0 && !mGame.isSolved()) {
            displayProgress();
            promptForGuess();
        }
        if (mGame.isSolved()) {
            System.out.printf("Congratulations, you won with %d tries remaining\n",
                                                    mGame.getRemainingTries());
        } else {
            System.out.printf("Sorry, 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:  ");
        try {
            isHit = mGame.applyGuess(guessAsString);
            isValidGuess = true;
        } catch (IllegalArgumentException iae) {
            console.printf("%s. Please try again.\n", iae.getMessage());
        }
     }   
     return isHit;
    }

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

}

public class Hangman {

    public static void main(String[] args) {
        // Enter amazing code here:
            if (args.length == 0) {
                System.out.println("Please enter a word");
                System.exit(0);
            }
            Game game = new Game(args[0]);
            Prompter prompter = new Prompter(game);
            prompter.play();
    }
}