Java - Create Tic Tac Toe Game

Tictactoe.java

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package com.thanhcs.tictactoe;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Tictactoe implements ActionListener{

    JFrame windown=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 Tictactoe()
    {
        windown.setLayout(new GridLayout(3, 3));
        windown.setSize(300, 300);
        windown.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        //add button
        windown.add(button1);
        windown.add(button2);
        windown.add(button3);
        windown.add(button4);
        windown.add(button5);
        windown.add(button6);
        windown.add(button7);
        windown.add(button8);
        windown.add(button9);

        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);


        windown.setVisible(true);

    }





    @Override
    public void actionPerformed(ActionEvent a) {
        count++;
        if(count%2==0)
        {
            letter = "O";
        }
        else
        {
            letter = "X";
        }
        if(a.getSource()==button1)
        {
            button1.setText(letter);
            button1.setEnabled(false);
        }

        if(a.getSource()==button2)
        {
            button2.setText(letter);
            button2.setEnabled(false);
        }

        if(a.getSource()==button3)
        {
            button3.setText(letter);
            button3.setEnabled(false);
        }
        if(a.getSource()==button4)
        {
            button4.setText(letter);
            button4.setEnabled(false);
        }

        if(a.getSource()==button5)
        {
            button5.setText(letter);
            button5.setEnabled(false);
        }

        if(a.getSource()==button6)
        {
            button6.setText(letter);
            button6.setEnabled(false);
        }
        if(a.getSource()==button7)
        {
            button7.setText(letter);
            button7.setEnabled(false);
        }

        if(a.getSource()==button8)
        {
            button8.setText(letter);
            button8.setEnabled(false);
        }

        if(a.getSource()==button9)
        {
            button9.setText(letter);
            button9.setEnabled(false);
        }
        
        
        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;
        }
        
        
        //hang doc
        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;
        }
        
        //hang cheo
        
        else if(button1.getText()==button5.getText()
                &&button5.getText()==button9.getText()
                &&button1.getText()!="")
        {
            win =true;
        }
        else if(button3.getText()==button5.getText()
                &&button5.getText()==button7.getText()
                &&button3.getText()!="")
        {
            win =true;
        }
        
        else
            win = false;
        
        
        if(win==true)
        {
            JOptionPane.showMessageDialog(null, letter+ " WINS");
        }
        else if(count==9&& win == false)
        {
            JOptionPane.showMessageDialog(null, "Game Over");
        }
       
    }


}

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test.java

package com.thanhcs.tictactoe;

import javax.swing.JFrame;

public class test {
    
    public static void main(String[] args) {
        
        Tictactoe app = new Tictactoe();
        
        
    }
    

}

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RESULT :