Hangman.java (console only, CS106A)

/*
 * File: Hangman.java
 * ------------------
 * This program will eventually play the Hangman game from
 * Assignment #4.
 */

import acm.graphics.*;
import acm.program.*;
import acm.util.*;

import java.awt.*;

public class Hangman extends ConsoleProgram {

    RandomGenerator rand = new RandomGenerator();
    HangmanLexicon lex = new HangmanLexicon();
    String secretWord = "";
    String currentWord = "";
    char guessedLetter;
    int turns = 0;
    boolean wordGuessed = false;
    int lettersLeftToGuess = 0;

    /* ONLY TO BE ADDED IF EXPORT TO JAR FILE (+ THEN CREATE MANIFEST FILE!)
     * public static void main(String[] args) {
        new Hangman().start(args);
    }*/

    public void run() {

        setupTheGame();

        //GUESSING LETTERS UNTIL EITHER NO TURNS LEFT OR WORD GUESSED
        while (turns < 8 && lettersLeftToGuess != 0) {

            getValidGuess();

            //check if letter is part of word and output result
            checkLetterAndUpdate();

        }

        //OUTPUT WIN OR FAIL MESSAGE
        if (turns == 8 && lettersLeftToGuess != 0) {
            println("You have no more turns left. You loose.");
            println("Restart the program to try again with a different word.");
            println("The word was " + secretWord);
        } else {
            println("Correct! You guessed the word after " + turns + " turns. To play again, restart the program.");

        }
    }

    private void checkLetterAndUpdate() {

        String guessedString = Character.toString(guessedLetter);
        int letterIndex = secretWord.indexOf(guessedString);
        if (letterIndex == -1) {
            turns ++;
            println("Sorry, that letter is not included in the word. Try another one.");
            println("You have " + (8 - turns) + " turns to guess the word.");
            println("Here is the current word: " + currentWord);
            println("");
        } else {
            currentWord = replaceAllOccurences(secretWord, currentWord, guessedString);
            println("Your guess was correct!");
            println("Here is the current word: " + currentWord);
            println("You have " + (8 - turns) + " turns to guess the word.");
            println("");
        }

    }

    private String replaceAllOccurences(String secretW, String currentW,
            String guessedString) {

        String result = currentW;

        int pos = 0;

        int index = secretW.indexOf(guessedString, pos);

        while (index != -1) {

            //assign index of char in secret word
            pos = index;

            //generate start and end STRINGS in currentW

            String start = currentW.substring(0, pos);
            String end = currentW.substring(pos + 1);

            //concatenate them in the result
            result = start + guessedString + end;

            //UP TO HERE IT WORKS

            //check anew if the string is again in the resulting string
            index = result.indexOf(guessedString, pos + 1);

            lettersLeftToGuess --;

        }

        return result;

    }

    private void setupTheGame() {

        //greet user
        println("Hello. You can play the hangman game here!");

        //choose a random word
        int indexOfSecretWord = rand.nextInt(0, lex.getWordCount());
        secretWord = lex.getWord(indexOfSecretWord);
        println("A random word has been chosen for you.");
        lettersLeftToGuess = secretWord.length();

        //print out blank current word
        for (int i = 0; i < secretWord.length(); i++) currentWord += "_ ";
        secretWord = secretWord.replace("", " ").trim();
        println("The word now looks like this: " + currentWord);

    }

    private void getValidGuess() {

        //ask until you get a valid guess
        while (true) {char guess = readLine("Enter your guess: ").charAt(0);
            if (Character.isLetter(guess)) {
                guessedLetter = Character.toUpperCase(guess);
                break;
            }
            else println("Your guess was not a valid letter. Please try again.");
        }

    }
}