In several Game Zone assignments earlier in this book, you created games similar

Question

In several Game Zone assignments earlier in this book, you created games similar to
Hangman in which the user guesses a secret phrase by selecting a series of letters.
These versions had limited appeal because each contained only a few possible
phrases to guess; after playing the games a few times, the user would have memorized
all the phrases. Now create a version in which any number of secret phrases
can be saved to a file before the game is played. Use a text editor such as Notepad to
type any number of phrases into a file, one per line. Save the file as Phrases.txt.
Then, create a game that randomly selects a phrase from the file and allows a user to
guess the phrase letter by letter. Save the game as SecretPhraseUsingFile.java.

Use Swing components to receive the inputs and report the outputs and user will continue to guess until successful

Explanation / Answer

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.Random;

import java.io.*;

public class SecretPhraseUsingFile extends JFrame implements ActionListener {

// some variables

int valid = 0, count = 0, entry;

String phrasePicked;

StringBuffer phrase;

// setup the file

RandomAccessFile random;

final int RECORD_SIZE = 36;

// setup some components

JLabel title = new JLabel("Secrte Phrase Game");

JLabel label1 = new JLabel("Play our game - guess the secret phrase - Click one letter");

JLabel label2 = new JLabel("");

JLabel secret = new JLabel("");

Font arialB30 = new Font("Arial", Font.BOLD, 30);

Font arialB20 = new Font("Arial", Font.BOLD, 20);

JButton playAgain = new JButton("Play Again?");

// setup the panel

JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT));

// put all the letters of the alphabet into a string

String alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

// initialize the array of letter buttons

JButton[] buttons = new JButton[alpha.length()];

public SecretPhraseUsingFile() {

// setup new frame

super("Secret Phrase Game");

// try to open the file for reading

try {

random = new RandomAccessFile("phrases.dat", "rw");

}

catch(IOException e1) {

System.err.println("File not opened");

System.exit(1);

}

// the following code block is used to find how many records are in the file

try {

while (valid == 0) {

random.seek(count * RECORD_SIZE);

entry = random.readInt();

if (entry == 0) {

valid = 1;

} else {

count++;

}

}

}

catch(IOException e2) {

System.err.println("Could not read file at record " + count + ".");

System.exit(1);

}

// randomly pick one of the phrases to use from the file

Random r = new Random();

int num = r.nextInt(count);

// try to read the picked phrase from the file

try {

random.seek(num * RECORD_SIZE);

entry = random.readInt();

phrasePicked = random.readUTF();

}

catch(IOException e3) {

System.err.println("Could not write to file");

System.exit(1);

}

// put the phrase in a string buffer called phrase

phrase = new StringBuffer(phrasePicked);

// setup the default close operation

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// setup the panel

add(panel);

title.setFont(arialB30);

label1.setFont(arialB20);

panel.add(title);

panel.add(label1);

// turn phrase into all "*", only letters, not spaces

int phraseLength = phrase.length();

for (int i = 0; i < phraseLength; i++) {

char letter = phrase.charAt(i);

if (Character.isLetter(letter)) {

phrase.setCharAt(i,'*');

}

}

// phrase the string buffer is copied into phraseSt the String

// can only set an applet object with a String

String phraseSt = phrase.toString();

secret.setText(phraseSt);

secret.setFont(arialB30);

panel.add(secret);

panel.add(label2);

// add button objects to the "buttons" array and setup the action listeners

int alphaLength = alpha.length();

for (int i = 0; i < alphaLength; i++) {

char letter = alpha.charAt(i);

String letterStr = Character.toString(letter);

buttons[i] = new JButton(letterStr);

panel.add(buttons[i]);

buttons[i].addActionListener(this);

playAgain.addActionListener(this);

}

}

public static void main(String[] args) {

// instantiate the new frame object

SecretPhraseUsingFile phrases = new SecretPhraseUsingFile();

phrases.setSize(600, 250);

phrases.setVisible(true);

}

public void actionPerformed(ActionEvent thisEvent) {

// find out what button was clicked

Object source = thisEvent.getSource();

if (source.equals(playAgain)) {

SecretPhraseUsingFile phrases = new SecretPhraseUsingFile();

phrases.setSize(600, 250);

phrases.setVisible(true);

}

for (int i = 0; i < buttons.length; i++) {

if (source.equals(buttons[i])) {

buttons[i].setEnabled(false);

String buttonText = buttons[i].getText();

// find out if the button clicked matches a letter in the phrase

// use "count" to keep track of how letters matched the letter clicked

int count = 0;

int phraseStrLength = phrasePicked.length();

for (int j = 0; j < phraseStrLength; j++) {

char letter = phrasePicked.charAt(j);

String letterStr = Character.toString(letter);

// if it matches swap out the *(s) for the letter(s)

if (letterStr.equalsIgnoreCase(buttonText)) {

phrase.setCharAt(j, letter);

// turn phrase back into a String and display the updated phrase

String phraseSt = phrase.toString();

secret.setText(phraseSt);

count++;

// count the *s in the phrase to see if any are left

int letterCount = 0;

int secretLength = phraseSt.length();

for (int k = 0; k < secretLength; k++) {

char letter1 = phraseSt.charAt(k);

if (letter1 == '*') letterCount++;

}

// if all the letters have been converted, disable all the buttons

// and display the Congratulations message

if (letterCount == 0) {

for (int m = 0; m < buttons.length; m++) {

buttons[m].setEnabled(false);

}

label2.setText("Congratulations!");

//panel.add(playAgain);

break;

}

}

// display a message based on if the letter was matched

if (count == 0) {

label2.setText("Sorry, " + buttonText + " is not in the phrase.");

} else if (count >= 1) {

label2.setText("Correct!");

}

}

}

}

}

}

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