All code is correct but there are two methods below in red where you need to do

Question

All code is correct but there are two methods below in red where you need to do the logic for the game. Basically, checking the board to see if anyone has won and if there are more spaces to be selected.

import javax.swing.*;
import java.awt.geom.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Color;
public class TicTacToe extends JPanel implements ActionListener
{
JLabel greeting = new JLabel("Tic Tac Toe");
JLabel promptLabel = new JLabel("Choose one button");
JLabel result = new JLabel();
Font headlineFont = new Font("Helvetica", Font.BOLD,
20);
Font mediumFont = new Font("Helvetica", Font.BOLD, 14);
final int SIZE = 9;
final static int ROW_SIZE = 3;
final static int COL_SIZE = 3;
int x, y;
JButton[][] gameGrid = new JButton[ROW_SIZE][COL_SIZE];
final static String BLANK = " ";
final static String XString = "X";
final static String OString = "O";
int row = 0, col = 0;
int num;
boolean spotFound;
boolean isDone = false;
boolean playersTurn = true;
boolean isWinPossible = false;
String msg = "";
String gridString;
char winChar;

public static boolean checkForWinner(JButton [][]
gameGrid)
{
boolean isDone = false;

// Your code goes here
//The code to check for winners needs to be
implemented
//checkForWinner returns a boolean value representing
a winner or not

return isDone;
}

public static boolean spacesRemain(JButton[][] grid)
{

// Your code goes here
// spacesRemain returns a boolean value indicating
that there are stillDigitsLeft
// spaces to be selected.

return stillDigitsLeft;
}
public static void chooseSpot(JButton[][] gameGrid)
{
int x, y;
boolean placementMade = false;
for(x = 0; x < ROW_SIZE && !placementMade; ++x)
{
if(gameGrid[x][0].getText().equals(OString) &&
gameGrid[x][1].getText().equals(OString) &&
gameGrid[x][2].getText().equals(BLANK))
{
gameGrid[x][2].setText(OString);
placementMade = true;
}
else
if(gameGrid[x][0].getText().equals(OString) &&
gameGrid[x][2].getText().equals(OString) &&
gameGrid[x][1].getText().equals(BLANK))

{
gameGrid[x][1].setText(OString);
placementMade = true;
}
else
if(gameGrid[x][1].getText().equals(OString) &&
gameGrid[x][2].getText().equals(OString) &&
gameGrid[x][0].getText().equals(BLANK))
{
gameGrid[x][0].setText(OString);
placementMade = true;
}
}
for(y = 0; y < COL_SIZE && !placementMade; ++y)
{
if(gameGrid[0][y].getText().equals(OString) &&
gameGrid[1][y].getText().equals(OString) &&
gameGrid[2][y].getText().equals(BLANK))
{
gameGrid[2][y].setText(OString);
placementMade = true;
}
else
if(gameGrid[0][y].getText().equals(OString) &&
gameGrid[2][y].getText().equals(OString) &&
gameGrid[1][y].getText().equals(BLANK))
{
gameGrid[1][y].setText(OString);
placementMade = true;
}
else
if(gameGrid[1][y].getText().equals(OString) &&
gameGrid[2][y].getText().equals(OString) &&
gameGrid[0][y].getText().equals(BLANK))
{
gameGrid[0][y].setText(OString);
placementMade = true;
}
}
if(!placementMade)
if(gameGrid[0][0].getText().equals(OString) &&
gameGrid[1][1].getText().equals(OString) &&
gameGrid[2][2].getText().equals(BLANK))
{
gameGrid[2][2].setText(OString);
placementMade = true;
}
else
if(gameGrid[0][0].getText().equals(OString) &&
gameGrid[2][2].getText().equals(OString) &&
gameGrid[1][1].getText().equals(BLANK))
{
gameGrid[1][1].setText(OString);
placementMade = true;
}
else
if(gameGrid[2][2].getText().equals(OString) &&
gameGrid[1][1].getText().equals(OString) &&
gameGrid[0][0].getText().equals(BLANK))
{
gameGrid[0][0].setText(OString);
placementMade = true;
}
else
if(gameGrid[0][2].getText().equals(OString) &&
gameGrid[1][1].getText().equals(OString) &&
gameGrid[2][0].getText().equals(BLANK))
{
gameGrid[2][0].setText(OString);
placementMade = true;
}
else
if(gameGrid[0][2].getText().equals(OString) &&
gameGrid[2][0].getText().equals(OString) &&
gameGrid[1][1].getText().equals(BLANK))
{
gameGrid[1][1].setText(OString);
placementMade = true;
}
else
if(gameGrid[1][1].getText().equals(OString) &&
gameGrid[2][0].getText().equals(OString) &&
gameGrid[0][2].getText().equals(BLANK))
{
gameGrid[0][2].setText(OString);
placementMade = true;
}
if(!placementMade)
{

while(!placementMade)
{
placementMade = true;
int num = (int)((Math.random() * 100) % 9);
x = num / 3;
y = num % 3;
if(!gameGrid[x][y].getText().equals(BLANK))
placementMade = false;
}
gameGrid[x][y].setText(OString);
}
}
public TicTacToe()
{
greeting.setFont(headlineFont);
add(greeting);
promptLabel.setFont(mediumFont);
add(promptLabel);
for(x = 0; x < ROW_SIZE; ++x)
for(y = 0; y < COL_SIZE; ++y)
{
gameGrid[x][y] = new JButton();
gameGrid[x][y].setText(BLANK);
add(gameGrid[x][y]);
gameGrid[x][y].addActionListener(this);
}
add(result);
}
@Override
public void actionPerformed(ActionEvent e)
{
isDone = false;
Object squareChosen = e.getSource();
for(x = 0; x < ROW_SIZE; ++x)
for(y = 0; y < COL_SIZE; ++y)
if(squareChosen == gameGrid[x][y])
{
row = x;
col = y;
x = ROW_SIZE;
y = COL_SIZE;
}
if(gameGrid[row][col].getText().equals(XString) ||
gameGrid[row][col].getText().equals(OString))
{
msg = "That position is already taken ";
}
else
{
gameGrid[row][col].setText(XString);
msg = "";
isDone = checkForWinner(gameGrid);

msg = "";
if(isDone)
{
msg = "You win! ";
winChar = 'x';
}
else
if(!spacesRemain(gameGrid))
{
isDone = true;
msg = " Tie game";
winChar = 't';
}
if(isDone)
result.setText("Game over! " + msg);
else
{
chooseSpot(gameGrid);
isDone = checkForWinner(gameGrid);
if(isDone)
{
result.setText("Sorry - you lose");
winChar = 'o';
}
}

}
if(isDone)
repaint();
}
@Override
public void paintComponent(Graphics gr)
{
super.paintComponent(gr);
float startx = 30f;
float starty = 210f;
float width = 50f;
float height = 50f;
Graphics2D g = (Graphics2D)gr;
BasicStroke aStroke = new BasicStroke(6.0f,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
g.setStroke(aStroke);
g.setColor(Color.BLUE);
if(winChar == 'x')
{
g.draw(new Line2D.Float(startx, starty, startx +
width, starty + height));
g.draw(new Line2D.Float(startx, starty +
height, startx + width, starty));
}
else
if(winChar == 'o')
{
g.draw(new Ellipse2D.Float(startx, starty,
width, height));
}
else
if(winChar == 't')
{
g.draw(new Line2D.Float(startx, starty,
startx + width, starty + height));
g.draw(new Line2D.Float(startx,
starty + height, startx + width, starty));
g.setColor(Color.RED);
g.draw(new Ellipse2D.Float(startx, starty,
width, height));

}
}
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.add(new TicTacToe());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(300, 300);
frame.setVisible(true);
}
}

Explanation / Answer

public static boolean checkForWinner(JButton [][] gameGrid)
{
boolean isDone = false;
boolean rowcheck, colcheck,digcheck;

for (int i = 0; i < 3; i++) {
if ((gameGrid[i][0] != ' ') && (gameGrid[i][0] == gameGrid[i][1]) && (gameGrid[i][1] == gameGrid[i][2])) rowcheck=true;
}
for (int i = 0; i < 3; i++) {
if ((gameGrid[0][i] != ' ') && (gameGrid[0][i] == gameGrid[1][i]) && (gameGrid[1][i] == gameGrid[2][i])) colcheck=true;
}
if (((gameGrid[0][0] != ' ') && (gameGrid[0][0] == gameGrid[1][1]) && (gameGrid[1][1] == gameGrid[2][2])) || ((gameGrid[0][2] != ' ') && (gameGrid[0][2] == gameGrid[1][1]) && (gameGrid[1][1] == gameGrid[2][0]))) digcheck=true;
if (rowcheck|| colcheck || digcheck) isDone=true;

return isDone;
}

public static boolean spacesRemain(JButton[][] grid)

{

boolean stillDigitsLeft =false;

for (int i = 0; i < 3; i++) {

for (int j = 0; j < 3; i++){

if(grid[i][j]==' ') {

stillDigitsLeft=true;

break;

}

}

}

return stillDigitsLeft;

}

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