Assuming that the system is a closed system, the mass of the system is constant througout the process.Hence the volume of the system doesnot change making it an isochoric process. So, win = 0 kJ/kg Solution Assuming that the system is a closed system, the mass of the system is constant througout the process.Hence the volume of the system doesnot change making it an isochoric process. So, win = 0 kJ/kg.

1. import java.util.Scanner;
import java.util.Random;
public class TicTacToe implements ActionListener {
final String VERSION = "3.0"
//Setting up ALL the variables
JFrame window = new JFrame("Tic-Tac-Toe " + VERSION);
JMenuBar mnuMain = new JMenuBar();
JMenuItem mnuNewGame = new JMenuItem("New Game"),
mnuInstruction = new JMenuItem("Instructions"),
mnuExit = new JMenuItem("Exit"),
mnuAbout = new JMenuItem("About");
JButton btn1v1 = new JButton("Player vs Player"),
btn1vCPU = new JButton("Player vs Computer"),
btnQuit = new JButton("Quit"),
btnSetName = new JButton("Set Player Names"),
btnContinue = new JButton("Continue..."),
btnTryAgain = new JButton("Try Again?");
JButton btnEmpty[] = new JButton[10];
JPanel pnlNewGame = new JPanel(),
pnlMenu = new JPanel(),
pnlMain = new JPanel(),
pnlTop = new JPanel(),
pnlBottom = new JPanel(),
pnlQuitNTryAgain = new JPanel(),
pnlPlayingField = new JPanel();
JLabel lblTitle = new JLabel("Tic-Tac-Toe"),
lblTurn = new JLabel(),
lblStatus = new JLabel("", JLabel.CENTER),
lblMode = new JLabel("", JLabel.LEFT);
JTextArea txtMessage = new JTextArea();
final int winCombo[ ][ ] = new int[ ][ ] {
{1, 2, 3}, {1, 4, 7}, {1, 5, 9},
{4, 5, 6}, {2, 5, 8}, {3, 5, 7},

2. {7, 8, 9}, {3, 6, 9}
/*Horizontal Wins*/ /*Vertical Wins*/ /*Diagonal Wins*/
};
final int X = 535, Y = 342,
mainColorR = 190, mainColorG = 50, mainColorB = 50,
btnColorR = 70, btnColorG = 70, btnColorB = 70;
Color clrBtnWonColor = new Color(190, 190, 190);
int turn = 1,
player1Won = 0, player2Won = 0,
wonNumber1 = 1, wonNumber2 = 1, wonNumber3 = 1,
option;
boolean inGame = false,
CPUGame = false,
win = false;
String message,
Player1 = "Player 1", Player2 = "Player 2",
tempPlayer2 = "Player 2";
public TicTacToe() { //Setting game properties and layout and sytle...
//Setting window properties:
window.setSize(X, Y);
window.setLocation(350, 260);
//window.setResizable(false);
window.setLayout(new BorderLayout());
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Setting Menu, Main, Top, Bottom Panel Layout/Backgrounds
pnlMenu.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlTop.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlBottom.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlNewGame.setBackground(new Color(mainColorR - 50, mainColorG - 50, mainColorB- 50));
pnlMenu.setBackground(new Color((mainColorR - 50), (mainColorG - 50), (mainColorB- 50)));
pnlMain.setBackground(new Color(mainColorR, mainColorG, mainColorB));
pnlTop.setBackground(new Color(mainColorR, mainColorG, mainColorB));
pnlBottom.setBackground(new Color(mainColorR, mainColorG, mainColorB));
//Setting up Panel QuitNTryAgain
pnlQuitNTryAgain.setLayout(new GridLayout(1, 2, 2, 2));
pnlQuitNTryAgain.add(btnTryAgain);

3. pnlQuitNTryAgain.add(btnQuit);
//Adding menu items to menu bar
mnuMain.add(mnuNewGame);
mnuMain.add(mnuInstruction);
mnuMain.add(mnuAbout);
mnuMain.add(mnuExit);// Menu Bar is Complete
//Adding buttons to NewGame panel
pnlNewGame.setLayout(new GridLayout(4, 1, 2, 10));
pnlNewGame.add(btnContinue);
pnlNewGame.add(btn1v1);
pnlNewGame.add(btn1vCPU);
pnlNewGame.add(btnSetName);
//Setting Button propertied
btnTryAgain.setEnabled(false);
btnContinue.setEnabled(false);
//Setting txtMessage Properties
txtMessage.setBackground(new Color(mainColorR-30, mainColorG-30, mainColorB-30));
txtMessage.setForeground(Color.white);
txtMessage.setEditable(false);
//Adding Action Listener to all the Buttons and Menu Items
mnuNewGame.addActionListener(this);
mnuExit.addActionListener(this);
mnuInstruction.addActionListener(this);
mnuAbout.addActionListener(this);
btn1v1.addActionListener(this);
btn1vCPU.addActionListener(this);
btnQuit.addActionListener(this);
btnSetName.addActionListener(this);
btnContinue.addActionListener(this);
btnTryAgain.addActionListener(this);
//Setting up the playing field
pnlPlayingField.setLayout(new GridLayout(3, 3, 2, 2));
pnlPlayingField.setBackground(Color.black);
for(int i=1; i<=9; i++) {
btnEmpty[i] = new JButton();
btnEmpty[i].setBackground(new Color(btnColorR, btnColorG, btnColorB));

4. btnEmpty[i].addActionListener(this);
pnlPlayingField.add(btnEmpty[i]);// Playing Field is Compelte
}
//Adding everything needed to pnlMenu and pnlMain
lblMode.setForeground(Color.white);
pnlMenu.add(lblMode);
pnlMenu.add(mnuMain);
pnlMain.add(lblTitle);
//Adding to window and Showing window
window.add(pnlMenu, BorderLayout.NORTH);
window.add(pnlMain, BorderLayout.CENTER);
window.setVisible(true);
}
public static void main(String[] args) {
new TicTacToe();// Calling the class construtor.
// PROGRAM STARTS HERE!
}
/*
-------------------------
Start of all METHODS. |
-------------------------
*/
public void showGame() { // Shows the Playing Field
// *IMPORTANT*- Does not start out brand new (meaning just shows what it had before)
clearPanelSouth();
pnlMain.setLayout(new BorderLayout());
pnlTop.setLayout(new BorderLayout());
pnlBottom.setLayout(new BorderLayout());
pnlTop.add(pnlPlayingField);
pnlBottom.add(lblTurn, BorderLayout.WEST);
pnlBottom.add(lblStatus, BorderLayout.CENTER);
pnlBottom.add(pnlQuitNTryAgain, BorderLayout.EAST);
pnlMain.add(pnlTop, BorderLayout.CENTER);
pnlMain.add(pnlBottom, BorderLayout.SOUTH);
pnlPlayingField.requestFocus();
inGame = true;

5. checkTurn();
checkWinStatus();
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void newGame() { // Sets all the game required variables to default
// and then shows the playing field.
// (Basically: Starts a new 1v1 Game)
btnEmpty[wonNumber1].setBackground(new Color(btnColorR, btnColorG, btnColorB));
btnEmpty[wonNumber2].setBackground(new Color(btnColorR, btnColorG, btnColorB));
btnEmpty[wonNumber3].setBackground(new Color(btnColorR, btnColorG, btnColorB));
for(int i=1; i<10; i++) {
btnEmpty[i].setText("");
btnEmpty[i].setEnabled(true);
}
turn = 1;
win = false;
showGame();
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void quit() {
inGame = false;
lblMode.setText("");
btnContinue.setEnabled(false);
clearPanelSouth();
setDefaultLayout();
pnlTop.add(pnlNewGame);
pnlMain.add(pnlTop);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void checkWin() { // checks if there are 3 symbols in a row vertically, diagonally, or
horizontally.
// then shows a message and disables buttons. If the game is
over then it asks

6. // if you want to play again.
for(int i=0; i<8; i++) {
if(
!btnEmpty[winCombo[i][0]].getText().equals("") &&
btnEmpty[winCombo[i][0]].getText().equals(btnEmpty[winCombo[i][1]].getText()) &&
// if {1 == 2 && 2 == 3}
btnEmpty[winCombo[i][1]].getText().equals(btnEmpty[winCombo[i][2]].getText())) {
/*
The way this checks the if someone won is:
First: it checks if the btnEmpty[x] is not equal to an empty string- x being the array
number
inside the multi-dementional array winCombo[checks inside each of the 7 sets][the
first number]
Secong: it checks if btnEmpty[x] is equal to btnEmpty[y]- x being winCombo[each set][the
first number]
y being winCombo[each set the same as x][the second number] (So basically checks
if the first and
second number in each set is equal to each other)
Third: it checks if btnEmtpy[y] is eual to btnEmpty[z]- y being the same y as last time and
being
winCombo[each set as y][the third number]
Conclusion: So basically it checks if it is equal to the btnEmpty is equal to each set of numbers
*/
win = true;
wonNumber1 = winCombo[i][0];
wonNumber2 = winCombo[i][1];
wonNumber3 = winCombo[i][2];
btnEmpty[wonNumber1].setBackground(clrBtnWonColor);
btnEmpty[wonNumber2].setBackground(clrBtnWonColor);
btnEmpty[wonNumber3].setBackground(clrBtnWonColor);
break;
}
}
if(win || (!win && turn>9)) {
if(win) {
if(btnEmpty[wonNumber1].getText().equals("X")) {

7. message = Player1 + " has won";
player1Won++;
}
else {
message = Player2 + " has won";
player2Won++;
}
} else if(!win && turn>9)
message = "Both players have tied! Better luck next time.";
showMessage(message);
for(int i=1; i<=9; i++) {
btnEmpty[i].setEnabled(false);
}
btnTryAgain.setEnabled(true);
checkWinStatus();
} else
checkTurn();
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void AI() {
int computerButton;
if(turn <= 9) {
turn++;
computerButton = CPU.doMove(
btnEmpty[1], btnEmpty[2], btnEmpty[3],
btnEmpty[4], btnEmpty[5], btnEmpty[6],
btnEmpty[7], btnEmpty[8], btnEmpty[9]);
if(computerButton == 0)
Random();
else {
btnEmpty[computerButton].setText("O");
btnEmpty[computerButton].setEnabled(false);
}
checkWin();
}

8. }
//-------------------------------------------------------------------------------------------------------------------
----------------
public void Random() {
int random;
if(turn <= 9) {
random = 0;
while(random == 0) {
random = (int)(Math.random() * 10);
}
if(CPU.doRandomMove(btnEmpty[random])) {
btnEmpty[random].setText("O");
btnEmpty[random].setEnabled(false);
} else {
Random();
}
}
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void checkTurn() {
String whoTurn;
if(!(turn % 2 == 0)) {
whoTurn = Player1 + " [X]";
} else {
whoTurn = Player2 + " [O]";
}
lblTurn.setText("Turn: " + whoTurn);
}
//-------------------------------------------------------------------------------------------------------------------
---------------
public void askUserForPlayerNames() {
String temp;
boolean tempIsValid = false;
temp = getInput("Enter player 1 name:", Player1);
if(temp == null) {/*Do Nothing*/}

9. else if(temp.equals(""))
showMessage("Invalid Name!");
else if(temp.equals(Player2)) {
option = askMessage("Player 1 name matches Player 2's Do you want to continue?", "Name
Match", JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
tempIsValid = true;
} else if(temp != null) {
tempIsValid = true;
}
if(tempIsValid) {
Player1 = temp;
tempIsValid = false;
}
temp = getInput("Enter player 2 name:", Player2);
if(temp == null) {/*Do Nothing*/}
else if(temp.equals(""))
showMessage("Invalid Name!");
else if(temp.equals(Player1)) {
option = askMessage("Player 2 name matches Player 1's Do you want to continue?", "Name
Match", JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
tempIsValid = true;
} else if(temp != null) {
tempIsValid = true;
}
if(tempIsValid) {
Player2 = temp;
tempPlayer2 = temp;
tempIsValid = false;
}
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void setDefaultLayout() {
pnlMain.setLayout(new GridLayout(2, 1, 2, 5));

10. pnlTop.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlBottom.setLayout(new FlowLayout(FlowLayout.CENTER));
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void checkWinStatus() {
lblStatus.setText(Player1 + ": " + player1Won + " | " + Player2 + ": " + player2Won);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public int askMessage(String msg, String tle, int op) {
return JOptionPane.showConfirmDialog(null, msg, tle, op);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public String getInput(String msg, String setText) {
return JOptionPane.showInputDialog(null, msg, setText);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void showMessage(String msg) {
JOptionPane.showMessageDialog(null, msg);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void clearPanelSouth() { //Removes all the possible panels
//that pnlMain, pnlTop, pnlBottom
//could have.
pnlMain.remove(lblTitle);
pnlMain.remove(pnlTop);
pnlMain.remove(pnlBottom);
pnlTop.remove(pnlNewGame);
pnlTop.remove(txtMessage);
pnlTop.remove(pnlPlayingField);
pnlBottom.remove(lblTurn);
pnlBottom.remove(pnlQuitNTryAgain);

11. }
/*
-------------------------------------
End of all non-Abstract METHODS. |
-------------------------------------
*/
//-------------------ACTION PERFORMED METHOD (Button Click --> Action?)-------------------
------//
public void actionPerformed(ActionEvent click) {
Object source = click.getSource();
for(int i=1; i<=9; i++) {
if(source == btnEmpty[i] && turn < 10) {
if(!(turn % 2 == 0))
btnEmpty[i].setText("X");
else
btnEmpty[i].setText("O");
btnEmpty[i].setEnabled(false);
pnlPlayingField.requestFocus();
turn++;
checkWin();
if(CPUGame && win == false)
AI();
}
}
if(source == mnuNewGame || source == mnuInstruction || source == mnuAbout) {
clearPanelSouth();
setDefaultLayout();
if(source == mnuNewGame) {//NewGame
pnlTop.add(pnlNewGame);
}
else if(source == mnuInstruction || source == mnuAbout) {
if(source == mnuInstruction) {// Instructions
message = "Instructions: " +
"Your goal is to be the first player to get 3 X's or O's in a " +
"row. (horizontally, diagonally, or vertically) " +
Player1 + ": X " +

12. Player2 + ": O ";
} else {//About
message = "About: " +
"Title: Tic-Tac-Toe " +
"Creator: Blmaster " +
"Version: " + VERSION + " ";
}
txtMessage.setText(message);
pnlTop.add(txtMessage);
}
pnlMain.add(pnlTop);
}
else if(source == btn1v1 || source == btn1vCPU) {
if(inGame) {
option = askMessage("If you start a new game," +
"your current game will be lost..." + " " +
"Are you sure you want to continue?",
"Quit Game?" ,JOptionPane.YES_NO_OPTION
);
if(option == JOptionPane.YES_OPTION)
inGame = false;
}
if(!inGame) {
btnContinue.setEnabled(true);
if(source == btn1v1) {// 1 v 1 Game
Player2 = tempPlayer2;
player1Won = 0;
player2Won = 0;
lblMode.setText("1 v 1");
CPUGame = false;
newGame();
} else {// 1 v CPU Game
Player2 = "Computer";
player1Won = 0;
player2Won = 0;
lblMode.setText("1 v CPU");

13. CPUGame = true;
newGame();
}
}
}
else if(source == btnContinue) {
checkTurn();
showGame();
}
else if(source == btnSetName) {
askUserForPlayerNames();
}
else if(source == mnuExit) {
option = askMessage("Are you sure you want to exit?", "Exit Game",
JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
System.exit(0);
}
else if(source == btnTryAgain) {
newGame();
btnTryAgain.setEnabled(false);
}
else if(source == btnQuit) {
quit();
}
pnlMain.setVisible(false);
pnlMain.setVisible(true);
}
//-------------------END OF ACTION PERFORMED METHOD-------------------------//
}
Solution
import java.util.Scanner;
import java.util.Random;

14. public class TicTacToe implements ActionListener {
final String VERSION = "3.0"
//Setting up ALL the variables
JFrame window = new JFrame("Tic-Tac-Toe " + VERSION);
JMenuBar mnuMain = new JMenuBar();
JMenuItem mnuNewGame = new JMenuItem("New Game"),
mnuInstruction = new JMenuItem("Instructions"),
mnuExit = new JMenuItem("Exit"),
mnuAbout = new JMenuItem("About");
JButton btn1v1 = new JButton("Player vs Player"),
btn1vCPU = new JButton("Player vs Computer"),
btnQuit = new JButton("Quit"),
btnSetName = new JButton("Set Player Names"),
btnContinue = new JButton("Continue..."),
btnTryAgain = new JButton("Try Again?");
JButton btnEmpty[] = new JButton[10];
JPanel pnlNewGame = new JPanel(),
pnlMenu = new JPanel(),
pnlMain = new JPanel(),
pnlTop = new JPanel(),
pnlBottom = new JPanel(),
pnlQuitNTryAgain = new JPanel(),
pnlPlayingField = new JPanel();
JLabel lblTitle = new JLabel("Tic-Tac-Toe"),
lblTurn = new JLabel(),
lblStatus = new JLabel("", JLabel.CENTER),
lblMode = new JLabel("", JLabel.LEFT);
JTextArea txtMessage = new JTextArea();
final int winCombo[ ][ ] = new int[ ][ ] {
{1, 2, 3}, {1, 4, 7}, {1, 5, 9},
{4, 5, 6}, {2, 5, 8}, {3, 5, 7},
{7, 8, 9}, {3, 6, 9}
/*Horizontal Wins*/ /*Vertical Wins*/ /*Diagonal Wins*/
};
final int X = 535, Y = 342,

15. mainColorR = 190, mainColorG = 50, mainColorB = 50,
btnColorR = 70, btnColorG = 70, btnColorB = 70;
Color clrBtnWonColor = new Color(190, 190, 190);
int turn = 1,
player1Won = 0, player2Won = 0,
wonNumber1 = 1, wonNumber2 = 1, wonNumber3 = 1,
option;
boolean inGame = false,
CPUGame = false,
win = false;
String message,
Player1 = "Player 1", Player2 = "Player 2",
tempPlayer2 = "Player 2";
public TicTacToe() { //Setting game properties and layout and sytle...
//Setting window properties:
window.setSize(X, Y);
window.setLocation(350, 260);
//window.setResizable(false);
window.setLayout(new BorderLayout());
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Setting Menu, Main, Top, Bottom Panel Layout/Backgrounds
pnlMenu.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlTop.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlBottom.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlNewGame.setBackground(new Color(mainColorR - 50, mainColorG - 50, mainColorB- 50));
pnlMenu.setBackground(new Color((mainColorR - 50), (mainColorG - 50), (mainColorB- 50)));
pnlMain.setBackground(new Color(mainColorR, mainColorG, mainColorB));
pnlTop.setBackground(new Color(mainColorR, mainColorG, mainColorB));
pnlBottom.setBackground(new Color(mainColorR, mainColorG, mainColorB));
//Setting up Panel QuitNTryAgain
pnlQuitNTryAgain.setLayout(new GridLayout(1, 2, 2, 2));
pnlQuitNTryAgain.add(btnTryAgain);
pnlQuitNTryAgain.add(btnQuit);
//Adding menu items to menu bar
mnuMain.add(mnuNewGame);
mnuMain.add(mnuInstruction);

16. mnuMain.add(mnuAbout);
mnuMain.add(mnuExit);// Menu Bar is Complete
//Adding buttons to NewGame panel
pnlNewGame.setLayout(new GridLayout(4, 1, 2, 10));
pnlNewGame.add(btnContinue);
pnlNewGame.add(btn1v1);
pnlNewGame.add(btn1vCPU);
pnlNewGame.add(btnSetName);
//Setting Button propertied
btnTryAgain.setEnabled(false);
btnContinue.setEnabled(false);
//Setting txtMessage Properties
txtMessage.setBackground(new Color(mainColorR-30, mainColorG-30, mainColorB-30));
txtMessage.setForeground(Color.white);
txtMessage.setEditable(false);
//Adding Action Listener to all the Buttons and Menu Items
mnuNewGame.addActionListener(this);
mnuExit.addActionListener(this);
mnuInstruction.addActionListener(this);
mnuAbout.addActionListener(this);
btn1v1.addActionListener(this);
btn1vCPU.addActionListener(this);
btnQuit.addActionListener(this);
btnSetName.addActionListener(this);
btnContinue.addActionListener(this);
btnTryAgain.addActionListener(this);
//Setting up the playing field
pnlPlayingField.setLayout(new GridLayout(3, 3, 2, 2));
pnlPlayingField.setBackground(Color.black);
for(int i=1; i<=9; i++) {
btnEmpty[i] = new JButton();
btnEmpty[i].setBackground(new Color(btnColorR, btnColorG, btnColorB));
btnEmpty[i].addActionListener(this);
pnlPlayingField.add(btnEmpty[i]);// Playing Field is Compelte
}
//Adding everything needed to pnlMenu and pnlMain

17. lblMode.setForeground(Color.white);
pnlMenu.add(lblMode);
pnlMenu.add(mnuMain);
pnlMain.add(lblTitle);
//Adding to window and Showing window
window.add(pnlMenu, BorderLayout.NORTH);
window.add(pnlMain, BorderLayout.CENTER);
window.setVisible(true);
}
public static void main(String[] args) {
new TicTacToe();// Calling the class construtor.
// PROGRAM STARTS HERE!
}
/*
-------------------------
Start of all METHODS. |
-------------------------
*/
public void showGame() { // Shows the Playing Field
// *IMPORTANT*- Does not start out brand new (meaning just shows what it had before)
clearPanelSouth();
pnlMain.setLayout(new BorderLayout());
pnlTop.setLayout(new BorderLayout());
pnlBottom.setLayout(new BorderLayout());
pnlTop.add(pnlPlayingField);
pnlBottom.add(lblTurn, BorderLayout.WEST);
pnlBottom.add(lblStatus, BorderLayout.CENTER);
pnlBottom.add(pnlQuitNTryAgain, BorderLayout.EAST);
pnlMain.add(pnlTop, BorderLayout.CENTER);
pnlMain.add(pnlBottom, BorderLayout.SOUTH);
pnlPlayingField.requestFocus();
inGame = true;
checkTurn();
checkWinStatus();
}
//-------------------------------------------------------------------------------------------------------------------

18. ----------------
public void newGame() { // Sets all the game required variables to default
// and then shows the playing field.
// (Basically: Starts a new 1v1 Game)
btnEmpty[wonNumber1].setBackground(new Color(btnColorR, btnColorG, btnColorB));
btnEmpty[wonNumber2].setBackground(new Color(btnColorR, btnColorG, btnColorB));
btnEmpty[wonNumber3].setBackground(new Color(btnColorR, btnColorG, btnColorB));
for(int i=1; i<10; i++) {
btnEmpty[i].setText("");
btnEmpty[i].setEnabled(true);
}
turn = 1;
win = false;
showGame();
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void quit() {
inGame = false;
lblMode.setText("");
btnContinue.setEnabled(false);
clearPanelSouth();
setDefaultLayout();
pnlTop.add(pnlNewGame);
pnlMain.add(pnlTop);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void checkWin() { // checks if there are 3 symbols in a row vertically, diagonally, or
horizontally.
// then shows a message and disables buttons. If the game is
over then it asks
// if you want to play again.
for(int i=0; i<8; i++) {
if(
!btnEmpty[winCombo[i][0]].getText().equals("") &&

19. btnEmpty[winCombo[i][0]].getText().equals(btnEmpty[winCombo[i][1]].getText()) &&
// if {1 == 2 && 2 == 3}
btnEmpty[winCombo[i][1]].getText().equals(btnEmpty[winCombo[i][2]].getText())) {
/*
The way this checks the if someone won is:
First: it checks if the btnEmpty[x] is not equal to an empty string- x being the array
number
inside the multi-dementional array winCombo[checks inside each of the 7 sets][the
first number]
Secong: it checks if btnEmpty[x] is equal to btnEmpty[y]- x being winCombo[each set][the
first number]
y being winCombo[each set the same as x][the second number] (So basically checks
if the first and
second number in each set is equal to each other)
Third: it checks if btnEmtpy[y] is eual to btnEmpty[z]- y being the same y as last time and
being
winCombo[each set as y][the third number]
Conclusion: So basically it checks if it is equal to the btnEmpty is equal to each set of numbers
*/
win = true;
wonNumber1 = winCombo[i][0];
wonNumber2 = winCombo[i][1];
wonNumber3 = winCombo[i][2];
btnEmpty[wonNumber1].setBackground(clrBtnWonColor);
btnEmpty[wonNumber2].setBackground(clrBtnWonColor);
btnEmpty[wonNumber3].setBackground(clrBtnWonColor);
break;
}
}
if(win || (!win && turn>9)) {
if(win) {
if(btnEmpty[wonNumber1].getText().equals("X")) {
message = Player1 + " has won";
player1Won++;
}
else {

20. message = Player2 + " has won";
player2Won++;
}
} else if(!win && turn>9)
message = "Both players have tied! Better luck next time.";
showMessage(message);
for(int i=1; i<=9; i++) {
btnEmpty[i].setEnabled(false);
}
btnTryAgain.setEnabled(true);
checkWinStatus();
} else
checkTurn();
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void AI() {
int computerButton;
if(turn <= 9) {
turn++;
computerButton = CPU.doMove(
btnEmpty[1], btnEmpty[2], btnEmpty[3],
btnEmpty[4], btnEmpty[5], btnEmpty[6],
btnEmpty[7], btnEmpty[8], btnEmpty[9]);
if(computerButton == 0)
Random();
else {
btnEmpty[computerButton].setText("O");
btnEmpty[computerButton].setEnabled(false);
}
checkWin();
}
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void Random() {

21. int random;
if(turn <= 9) {
random = 0;
while(random == 0) {
random = (int)(Math.random() * 10);
}
if(CPU.doRandomMove(btnEmpty[random])) {
btnEmpty[random].setText("O");
btnEmpty[random].setEnabled(false);
} else {
Random();
}
}
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void checkTurn() {
String whoTurn;
if(!(turn % 2 == 0)) {
whoTurn = Player1 + " [X]";
} else {
whoTurn = Player2 + " [O]";
}
lblTurn.setText("Turn: " + whoTurn);
}
//-------------------------------------------------------------------------------------------------------------------
---------------
public void askUserForPlayerNames() {
String temp;
boolean tempIsValid = false;
temp = getInput("Enter player 1 name:", Player1);
if(temp == null) {/*Do Nothing*/}
else if(temp.equals(""))
showMessage("Invalid Name!");
else if(temp.equals(Player2)) {
option = askMessage("Player 1 name matches Player 2's Do you want to continue?", "Name

22. Match", JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
tempIsValid = true;
} else if(temp != null) {
tempIsValid = true;
}
if(tempIsValid) {
Player1 = temp;
tempIsValid = false;
}
temp = getInput("Enter player 2 name:", Player2);
if(temp == null) {/*Do Nothing*/}
else if(temp.equals(""))
showMessage("Invalid Name!");
else if(temp.equals(Player1)) {
option = askMessage("Player 2 name matches Player 1's Do you want to continue?", "Name
Match", JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
tempIsValid = true;
} else if(temp != null) {
tempIsValid = true;
}
if(tempIsValid) {
Player2 = temp;
tempPlayer2 = temp;
tempIsValid = false;
}
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void setDefaultLayout() {
pnlMain.setLayout(new GridLayout(2, 1, 2, 5));
pnlTop.setLayout(new FlowLayout(FlowLayout.CENTER));
pnlBottom.setLayout(new FlowLayout(FlowLayout.CENTER));
}
//-------------------------------------------------------------------------------------------------------------------

23. ----------------
public void checkWinStatus() {
lblStatus.setText(Player1 + ": " + player1Won + " | " + Player2 + ": " + player2Won);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public int askMessage(String msg, String tle, int op) {
return JOptionPane.showConfirmDialog(null, msg, tle, op);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public String getInput(String msg, String setText) {
return JOptionPane.showInputDialog(null, msg, setText);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void showMessage(String msg) {
JOptionPane.showMessageDialog(null, msg);
}
//-------------------------------------------------------------------------------------------------------------------
----------------
public void clearPanelSouth() { //Removes all the possible panels
//that pnlMain, pnlTop, pnlBottom
//could have.
pnlMain.remove(lblTitle);
pnlMain.remove(pnlTop);
pnlMain.remove(pnlBottom);
pnlTop.remove(pnlNewGame);
pnlTop.remove(txtMessage);
pnlTop.remove(pnlPlayingField);
pnlBottom.remove(lblTurn);
pnlBottom.remove(pnlQuitNTryAgain);
}
/*
-------------------------------------
End of all non-Abstract METHODS. |

24. -------------------------------------
*/
//-------------------ACTION PERFORMED METHOD (Button Click --> Action?)-------------------
------//
public void actionPerformed(ActionEvent click) {
Object source = click.getSource();
for(int i=1; i<=9; i++) {
if(source == btnEmpty[i] && turn < 10) {
if(!(turn % 2 == 0))
btnEmpty[i].setText("X");
else
btnEmpty[i].setText("O");
btnEmpty[i].setEnabled(false);
pnlPlayingField.requestFocus();
turn++;
checkWin();
if(CPUGame && win == false)
AI();
}
}
if(source == mnuNewGame || source == mnuInstruction || source == mnuAbout) {
clearPanelSouth();
setDefaultLayout();
if(source == mnuNewGame) {//NewGame
pnlTop.add(pnlNewGame);
}
else if(source == mnuInstruction || source == mnuAbout) {
if(source == mnuInstruction) {// Instructions
message = "Instructions: " +
"Your goal is to be the first player to get 3 X's or O's in a " +
"row. (horizontally, diagonally, or vertically) " +
Player1 + ": X " +
Player2 + ": O ";
} else {//About
message = "About: " +
"Title: Tic-Tac-Toe " +

25. "Creator: Blmaster " +
"Version: " + VERSION + " ";
}
txtMessage.setText(message);
pnlTop.add(txtMessage);
}
pnlMain.add(pnlTop);
}
else if(source == btn1v1 || source == btn1vCPU) {
if(inGame) {
option = askMessage("If you start a new game," +
"your current game will be lost..." + " " +
"Are you sure you want to continue?",
"Quit Game?" ,JOptionPane.YES_NO_OPTION
);
if(option == JOptionPane.YES_OPTION)
inGame = false;
}
if(!inGame) {
btnContinue.setEnabled(true);
if(source == btn1v1) {// 1 v 1 Game
Player2 = tempPlayer2;
player1Won = 0;
player2Won = 0;
lblMode.setText("1 v 1");
CPUGame = false;
newGame();
} else {// 1 v CPU Game
Player2 = "Computer";
player1Won = 0;
player2Won = 0;
lblMode.setText("1 v CPU");
CPUGame = true;
newGame();
}
}

26. }
else if(source == btnContinue) {
checkTurn();
showGame();
}
else if(source == btnSetName) {
askUserForPlayerNames();
}
else if(source == mnuExit) {
option = askMessage("Are you sure you want to exit?", "Exit Game",
JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
System.exit(0);
}
else if(source == btnTryAgain) {
newGame();
btnTryAgain.setEnabled(false);
}
else if(source == btnQuit) {
quit();
}
pnlMain.setVisible(false);
pnlMain.setVisible(true);
}
//-------------------END OF ACTION PERFORMED METHOD-------------------------//
}