Chapter 5, Problem 6PP

a.

Method heading for each method:

• The method heading is “public void makeGuess(character c)” that takes a parameter “c” of character type and return nothing.
• The method heading is “public String getDisguisedWord()” that takes no parameters and returns the string which contains the disguised word...

b.

Preconditions and postconditions of each method:

• Precondition and postcondition of “public void makeGuess(character c)” method.
  • Precondition: checks whether the character value is one of 26 alpha characters which present in secrete word or not.
  • Postcondition: update the number of guesses, incorrect guesses, and disguised word.
• Precondition and postcondition of “public String getDisguisedWord()” method.
  • Precondition: None.
  • Postcondition: This method returns disguised string.
• Precondition and postcondition of “public String getSecretWord()” method...

c.

Test class for some Java statement:

//Create an object for Hangman class

Hangman game = new Hangman();

//Call initialize() method to set the secret word

game.initialize("Happiness");

//Call playGame() method to play the game

System.out.println("Lets play a round of hangman...

d.

Implementation of class:

Hangman.java:

//Import the java package

import java.util.Scanner;

//Define the class

public class Hangman

{

    //Declare the required variables

    private String secretWord;

    private String disguisedWord;

    private String lettersRemaining;

    private int guessesMade;

    private int incorrectGuesses;

    //Define the makeGuess() method

    public void makeGuess(Character c)

    {

        //Check whether character is letter

        if (Character.isLetter(c))

        {

            //Declare and assign the variable

            String guess = "" + c;

            //Convert the guess to lower case

            guess = guess.toLowerCase();

            //Declare and initialize the letter position

int letterPosition = lettersRemaining.indexOf(guess);

            boolean goodGuess = letterPosition > -1;

/*Loop executes until the position is greater than "-1". */

            while (letterPosition > -1)

            {

/*Declare and assign the before letter variable. */

String before = lettersRemaining.substring(0, letterPosition);

/*Declare and assign the after letter variable. */

String after = lettersRemaining.substring(letterPosition + 1);

                //Set the letter remaining

                lettersRemaining = before + "#" + after;

                //Set the disguised waord

before = disguisedWord.substring(0, letterPosition);

after = disguisedWord.substring(letterPosition + 1);

                disguisedWord = before + guess + after;

                //Set the word position

letterPosition = lettersRemaining...

e.

List of extra methods and attributes needed for this implementation:

There is no extra attributes are needed for this implementation.

The extra methods that were used apart from the mentioned methods are,

• public void initialize() method:
  • This method is used to initialize the declared variables...

f.

Implementation of class:

Hangman.java:

//Import the java package

import java.util.Scanner;

//Define the class

public class Hangman

{

    //Declare the required variables

    private String secretWord;

    private String disguisedWord;

    private String lettersRemaining;

    private int guessesMade;

    private int incorrectGuesses;

    //Define the initialize()  method

    public void initialize(String word)

    {

        //Initialize the declared variables

        secretWord = word.toLowerCase().trim();

        lettersRemaining = secretWord;

        disguisedWord = createDisguisedWord(secretWord);

        guessesMade = 0;

        incorrectGuesses = 0;

    }

    //Define the createDisguisedWord() method

    public String createDisguisedWord(String word)

    {

        //Convert the secret word into lower case word

        word = word.toLowerCase();

/*Call replace() method to replace the "?" with suitable letter. */

        word = word.replace('a', '?');

        word = word.replace('b', '?');

        word = word.replace('c', '?');

        word = word.replace('d', '?');

        word = word.replace('e', '?');

        word = word.replace('f', '?');

        word = word.replace('g', '?');

        word = word.replace('h', '?');

        word = word.replace('i', '?');

        word = word.replace('j', '?');

        word = word.replace('k', '?');

        word = word.replace('l', '?');

        word = word.replace('m', '?');

        word = word.replace('n', '?');

        word = word.replace('o', '?');

        word = word.replace('p', '?');

        word = word.replace('q', '?');

        word = word.replace('r', '?');

        word = word.replace('s', '?');

        word = word.replace('t', '?');

        word = word.replace('u', '?');

        word = word.replace('v', '?');

        word = word.replace('w', '?');

        word = word.replace('x', '?');

        word = word.replace('y', '?');

        word = word.replace('z', '?');

        //Return the secret word

        return word;

    }

    //Define the makeGuess() method

    public void makeGuess(Character c)

    {

        //Check whether character is letter

        if (Character.isLetter(c))

        {

            //Declare and assign the variable

            String guess = "" + c;

            //Convert the guess to lower case

            guess = guess.toLowerCase();

            //Declare and initialize the letter position

int letterPosition = lettersRemaining.indexOf(guess);

            boolean goodGuess = letterPosition > -1;

/*Loop executes until the position is greater than "-1". */

            while (letterPosition > -1)

            {

/*Declare and assign the before letter variable. */

String before = lettersRemaining.substring(0, letterPosition);

/*Declare and assign the after letter variable. */

String after = lettersRemaining.substring(letterPosition + 1);

                //Set the letter remaining

                lettersRemaining = before + "#" + after;

                //Set the disguised waord

before = disguisedWord.substring(0, letterPosition);

after = disguisedWord.substring(letterPosition + 1);

                disguisedWord = before + guess + after;

                //Set the word position

letterPosition = lettersRemaining.indexOf(guess);

            }

            //Increment the guess count by "1"

            guessesMade++;

            //Check whether the Guess is not valid

            if (!goodGuess)

                //Increment the incorrect guess by "1"

                incorrectGuesses++;

        }

        //Otherwise, display the error message

        else

System...