Tic Tac Toe GUI Java NetBeans

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package main;

/**
 *
 * @author markjasongalang
 */
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

class TicTacToe implements ActionListener {

    Random random = new Random();
    JFrame frame = new JFrame();
    JPanel title_panel = new JPanel();
    JPanel button_panel = new JPanel();
    JLabel textfield = new JLabel();
    JButton[] buttons = new JButton[9];
    boolean player1_turn;
    boolean player2_turn;

    TicTacToe() {
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 800);
        frame.getContentPane().setBackground(new Color(50, 50, 50));
        frame.setLayout(new BorderLayout());
        frame.setVisible(true);

        textfield.setBackground(new Color(25, 25, 25));
        textfield.setForeground(new Color(25, 255, 0));
        textfield.setFont(new Font("Arial", Font.BOLD, 75));
        textfield.setHorizontalAlignment(JLabel.CENTER);
        textfield.setText("Tic-Tac-Toe");
        textfield.setOpaque(true);

        title_panel.setLayout(new BorderLayout());
        title_panel.setBounds(0, 0, 800, 100);

        button_panel.setLayout(new GridLayout(3, 3));
        button_panel.setBackground(new Color(150, 150, 150));

        for (int i = 0; i < 9; i++) {
            buttons[i] = new JButton();
            button_panel.add(buttons[i]);
            buttons[i].setFont(new Font("Arial", Font.BOLD, 120));
            buttons[i].setFocusable(false);
            buttons[i].addActionListener(this);
        }

        title_panel.add(textfield);
        frame.add(title_panel, BorderLayout.NORTH);
        frame.add(button_panel);
    }

    public void actionPerformed(ActionEvent e) {

    }
}

public class Main {
    public static void main(String[] args) {
        TicTacToe game = new TicTacToe();
    }
}