HangMan.java

import java.util.Scanner;
import java.util.ArrayList;
import java.io.*;

public class HangMan {

    /**
    *   Program:    HangMan.java
    *   Purpose:    Traditional word guessing game, uses files to store data
    *   Creator:    Chris Clarke
    *   Created:    12.11.2012
    */

/*
- Create a list of possible words called "words.txt"
- The games suppose to display the word to be guessed as a series of "*"'s.

- If the letters guessed correctly, the letter becomes displayed amongst the series of "*"'s.
- Display all the letters used (correctly & incorrectly) above the word.
- If the words guessed correctly add up the score (5 points per letters and -5 off the
 final score per word that was guessing incorrectly e.g. - if the words "blue" then it'll be
 worth 20 points, 3 wrong guesses makes the final score 5).
- If the player gets 5 wrong guesses, it's an instant loss, and they get a score of 0.
- If the player looses, prompt them to input their name and have it stored in another text file
 labelled "scores.txt".
- And then, start again with a new word.
*/

    public static void main(String[] args) {
        File f = new File("words.txt");
        Scanner scan;
        int wordCount = 0;
        ArrayList<String> words = new ArrayList<String>();
        try {
            scan = new Scanner(f); // to read file
            while (scan.hasNext()) {
                wordCount++;
                words.add(scan.next());
            }
            scan.close();
        } catch (FileNotFoundException x) {
            System.out.println("File not found!");
            System.exit(1);
        }

        Scanner input = new Scanner(System.in); // for user input

        int wordNumber = 0;
        String theWord;
        String letter;

        do {
            System.out.println("Can you guess the word?");
            theWord = words.get(wordNumber);
            int len = theWord.length();
            boolean[] discovered = new boolean[len];
            boolean solved = false;
            String usedLetters = "";
            int wrongGuesses = 0;
            score = 0;

            do {
                System.out.println("Used letters: "+usedLetters);
                showState(theWord, discovered);
                do {
                    System.out.print("Guess a letter: ");
                    letter = input.nextLine().toLowerCase();
                    letter = letter.substring(0, 1);
                } while (contains(letter, usedLetters));

                usedLetters += letter;

                if (guessLetter(letter, theWord, discovered)) {
                    solved = true;
                    for (int i=0; i<theWord.length(); i++) {
                        if (!discovered[i]) {
                            solved = false;
                        }
                    }
                    if (solved) break;
                } else {
                    wrongGuesses++;
                    if (wrongGuesses==MAX_WRONG_GUESSES) {
                        instantLoss(input);
                        break;
                    }
                }
            } while (true);

            if (solved) {
                System.out.println(theWord);
                System.out.println("Congratulations!  You got it!");
                score -= (wrongGuesses * POINTS_PER_LETTER);
                System.out.println("Score: "+score+"\n");
            } else {
                System.out.println("Try again.");
            }

            wordNumber++;
        } while (wordNumber<wordCount);

        System.out.println("Game Over");
    } // end main

    public static boolean contains(String s0, String s1) {
        for (int i=0; i<s1.length(); i++) {
            if (s0.equals(s1.substring(i, i+1))) {
                return true;
            }
        }
        return false;
    } // end contains

    public static boolean guessLetter(String letter, String theWord, boolean[] discovered) {
        boolean found1 = false;
        for (int i=0; i<theWord.length(); i++) {
            if (letter.equals(theWord.substring(i, i+1))) {
                if (!discovered[i]) {
                    discovered[i] = true;
                    score += POINTS_PER_LETTER;
                    found1 = true;
                }
            }
        }
        return found1;
    } // end guessLetter

    public static void saveText(String n, String filename) {
        try {
            FileWriter fw = new FileWriter(new File(filename));
            fw.write(n);
            fw.close();
        } catch (IOException x) {
            System.out.println("Trouble writing to file!");
            System.exit(1);
        }
    } // end saveText

    public static void showState(String w, boolean[] discovered) {
        for (int i=0; i< w.length(); i++) {
            if (discovered[i]) {
                System.out.print(w.substring(i, i+1));
            } else {
                System.out.print("*");
            }
        }
        System.out.println();
    } // end showState

    public static void instantLoss(Scanner input) {
        System.out.println("You lose.  Your score is zero.");
        System.out.println("Enter your name: ");
        String name = input.nextLine();
        saveText(name, "scores.txt");
        System.out.println("File \"scores.txt\" created successfully.");
    } // end instantLoss

    private static int score = 0;

    private static final int MAX_WRONG_GUESSES = 5;
    private static final int POINTS_PER_LETTER = 5;
} // end class