Tic Tac Toe

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TicTacToeSwing  implements ActionListener
{
    //Insantiate Variables
    private JFrame window = new JFrame("Tic-Tac-Toe");
    private JButton button1 = new JButton("");
    private JButton button2 = new JButton("");
    private JButton button3 = new JButton("");
    private JButton button4 = new JButton("");
    private JButton button5 = new JButton("");
    private JButton button6 = new JButton("");
    private JButton button7 = new JButton("");
    private JButton button8 = new JButton("");
    private JButton button9 = new JButton("");
    private String letter = "";
    private int count = 0;
    private boolean win = false;

    public TicTacToeSwing()
    {
        //Create Window
        window.setSize(300, 300);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setLayout(new GridLayout(3, 3));

        //Add buttons
        window.add(button1);
        window.add(button2);
        window.add(button3);
        window.add(button4);
        window.add(button5);
        window.add(button6);
        window.add(button7);
        window.add(button8);
        window.add(button9);

        //Add Action Listener
        button1.addActionListener(this);
        button2.addActionListener(this);
        button3.addActionListener(this);
        button4.addActionListener(this);
        button5.addActionListener(this);
        button6.addActionListener(this);
        button7.addActionListener(this);
        button8.addActionListener(this);
        button9.addActionListener(this);

        //Make window visible
        window.setVisible(true);
    }

    public void actionPerformed(ActionEvent a)
    {
        count++;

        //Figure out who's turn it is
        if(count == 1 || count == 3 || count == 5 || count == 7 || count == 9)
        {
            letter = "X";
        }
        else if (count == 2 || count == 4 || count == 6 || count == 8)
        {
            letter = "O";
        }

        //Display X's and O's
        if (a.getSource() == button1)
        {
            button1.setText(letter);
            button1.setEnabled(false);
        }
        else if (a.getSource() == button2)
        {
            button2.setText(letter);
            button2.setEnabled(false);
        }
        else if (a.getSource() == button3)
        {
            button3.setText(letter);
            button3.setEnabled(false);
        }
        else if (a.getSource() == button4)
        {
            button4.setText(letter);
            button4.setEnabled(false);
        }
        else if (a.getSource() == button5)
        {
            button5.setText(letter);
            button5.setEnabled(false);
        }
        else if (a.getSource() == button6)
        {
            button6.setText(letter);
            button6.setEnabled(false);
        }
        else if (a.getSource() == button7)
        {
            button7.setText(letter);
            button7.setEnabled(false);
        }
        else if (a.getSource() == button8)
        {
            button8.setText(letter);
            button8.setEnabled(false);
        }
        else if (a.getSource() == button9)
        {
            button9.setText(letter);
            button9.setEnabled(false);
        }


        //Determine who won
        if(button1.getText() == button2.getText()
                && button2.getText() == button3.getText()
                && button1.getText() != "")
        {
            win = true;
        }
        else if(button4.getText() == button5.getText()
                    && button5.getText() == button6.getText()
                    && button4.getText() != "")
        {
            win = true;
        }
        else if(button7.getText() == button8.getText()
                    && button8.getText() == button9.getText()
                    && button7.getText() != "")
        {
            win = true;
        }
        else if(button1.getText() == button4.getText()
                    && button4.getText() == button7.getText()
                    && button1.getText() != "")
        {
            win = true;
        }
        else if(button2.getText() == button5.getText()
                    && button5.getText() == button8.getText()
                    && button2.getText() != "")
        {
            win = true;
        }
        else if(button3.getText() == button6.getText()
                        && button6.getText() == button9.getText()
                        && button3.getText() != "")
        {
                win = true;
        }
        else if(button1.getText() == button5.getText()
                    && button5.getText() == button9.getText()
                    && button1.getText() != "")
        {
            win = true;
        }
        else if(button3.getText() == button5.getText()
                    && button5.getText() == button7.getText()
                    && button1.getText() != "")
        {
            win = true;
        }
        else
        {
            win = false;
        }

        if (win == true)
        {
            JOptionPane.showMessageDialog(null,
                                          letter + " Wins!");
        }
        else if (count == 9 && win == false)
        {
            JOptionPane.showMessageDialog(null,
                                          "Tie Game!");
        }
    }

    public static void main(String[] args)
    {
        new TicTacToeSwing();
    }
}