NoughtsAndCrossesGame play button doesn't work

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package test;

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

/**
 *
 * @author 000621812
 */
public class NoughtsAndCrossesGamev2 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        NoughtsAndCrossesGameFrame noughtsAndCrossesGame;

        noughtsAndCrossesGame = new NoughtsAndCrossesGameFrame();
        noughtsAndCrossesGame.setVisible(true);


    }
}

class NoughtsAndCrossesGameFrame extends JFrame {

    NoughtsAndCrossesGamePanel gamePanel;
    NoughtsAndCrossesButtonPanel buttonPanel;
    private ButtonPlayActionHandle playHandler;
    private ButtonExitActionHandler exitHandler;
    private JButton playButton;
    private JButton exitButton;

    public NoughtsAndCrossesGameFrame() {

        gamePanel = new NoughtsAndCrossesGamePanel();
        buttonPanel = new NoughtsAndCrossesButtonPanel();


        this.setLayout(new GridLayout(3, 3));
        this.setLayout(new FlowLayout());


        this.setVisible(true);


        this.setTitle("Noughts and Crosses");
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        this.add(playButton );
        this.add(exitButton );

        this.add(gamePanel, FlowLayout.LEFT);
        this.add(buttonPanel,FlowLayout.LEFT);


     this.setSize(145, 145);
    this.setVisible(true);














    }

    /**
     * Asks the panel containing the game to reset the game.
     */
    private void resetGame() {
        //**
//* The button panel



//*/
    }

    class NoughtsAndCrossesButtonPanel extends JPanel {

        /**
         * The game panel
         *
         */
        public NoughtsAndCrossesButtonPanel() {


            playButton = new JButton("Play");
            playButton.addActionListener(playHandler);
            playHandler = new ButtonPlayActionHandle();

             exitButton = new JButton("Exit");
            exitHandler = new ButtonExitActionHandler();
            exitButton.addActionListener(exitHandler);








        }
    }
}

class NoughtsAndCrossesGamePanel extends JPanel {

    private int clickCount = 0;
    private JButton[] btnKeypad = new JButton[9];

    public NoughtsAndCrossesGamePanel() {
        /**
         * Resets the buttons and clicjCount ready for a new game
         */
        HandlePlayerShot shotHandler = new HandlePlayerShot();
        // Set some JFrame details




        // NOTE - In grid layout you provide the number of
        // rows and columns but columns are ignored and always set equal to rows
        // unless the rows are zero.
        //TODO

        this.setLayout(new BorderLayout());
        this.setLayout(new GridLayout(3, 3));
     this.setSize(110, 110);
    this.setVisible(true);









        // Create the buttons and add them  to the JFrame
        for (int i = 0; i < 9; i++) {
            btnKeypad[i] = new JButton(" ");
            this.add(btnKeypad[i]);
            btnKeypad[i].addActionListener(shotHandler);


            //TODO
        }

        // Register the same listener for each button as the action needed is always the same.
        // Note - this could have been done in the above loop but is shown separately here to make
        // it clearer.
        //shotHandler = new HandlePlayerShot();



     this.setSize(200, 200);





    }

    private void resetGame() {
        /**
         * Disables all the buttons when the game ends
         *
         */
        for(int i=0; i<9; i++)
        {
            char ch=(char)('0'+i+1);
            btnKeypad[i].setText(""+ch);


        }






    }

    private void gameFinished() {
        /**
         * Inner class of NoughtsAndCrossesGamePanel to handle a players shot
         * ie when a game button is pressed.
         *
         */
        for (int i = 0; i < 9; i++) {

            btnKeypad[i].setEnabled(false);


        }
        //this.dispose(gamePanel);
    }

    class HandlePlayerShot implements ActionListener { //TODO  implements ????

        /**
         * Inner class of NoughtsAndCrossesGameFrame to respond to the Exit Button being
         * pressed. Dispose of the frame and exits the application
         */
        @Override
        /**
         * Responds to the button press - ie player shot
         */
        public void actionPerformed(ActionEvent e) {
            JButton currentButton;
            String winner;

            clickCount++;
            currentButton = (JButton) (e.getSource());
            // If it is an odd click count (button press count) then it is "X"
            // shot as "X" player always goes first
            if (clickCount % 2 == 1) {
                currentButton.setText("X");
            } else {
                currentButton.setText("0");
            }
            currentButton.setEnabled(false);
            winner = checkForWinner();
            if (winner != null) {
                //Display a message showing who the winner is
                //TODO
                JOptionPane.showMessageDialog(null, "The winner is " + winner);

                //NoughtsAndCrossesGamePanel.this.dispose();
            } else {
                // check that all possible shots have been had
                if (clickCount == 9) {
                    //Display a message saying it is a drawn game
                    //TODO

                    JOptionPane.showMessageDialog(null, "Draw!");

                }
            }
        }

        /**
         * Checks if the button in btnKeypad array in positions i, j, k
         * all have the same text.
         * @param i - button number
         * @param j - button number
         * @param k - button number
         * @return true if button i,j,k
         */
        private boolean isAWinner(int i, int j, int k) {
            return !btnKeypad[i].getText().equals(" ")
                    && btnKeypad[i].getText().equals(btnKeypad[j].getText())
                    && btnKeypad[i].getText().equals(btnKeypad[k].getText());
        }

        /**
         * Checks for all possible winning scenarios
         * @return null if there is no winner or the text on the button of the
         * winner
         */
        public String checkForWinner() {
            /* Assumed mapping of button indexes to position in game is -
             *  012
             *  345
             *  678
             */
            int winner = -1; // -1 value means there was no winner

            if (isAWinner(0, 1, 2)) {// Horizontal row 1
                winner = 0;
            } else if (isAWinner(3, 4, 5)) {    // Horizontal row 2
                winner = 3;
            } else if (isAWinner(6, 7, 8)) {    // Horizontal row 3
                winner = 6;
            } else if (isAWinner(0, 3, 6)) {    // Vertical row 1
                winner = 0;
            } else if (isAWinner(1, 4, 7)) {    // Vertical row 2
                winner = 1;
            } else if (isAWinner(2, 5, 8)) {    // Vertical row 3
                winner = 2;
            } else if (isAWinner(0, 4, 8)) {    // Diagonal 1
                winner = 0;
            } else if (isAWinner(2, 4, 6)) {    // Diagonal 2
                winner = 2;
            }

            if (winner != -1) {
                return btnKeypad[winner].getText();
            } else {
                return null;
            }
        }
    }
}

class ButtonExitActionHandler implements ActionListener {

    /**
     * Inner class of NoughtsAndCrossesGameFrame to respond to the Play Button being
     * pressed. Asks the frame to reset the game by calling the frames resetGame
     * method
     */
    public void actionPerformed(ActionEvent e) {
        //this.dispose(gamePanel);
        System.exit(0);

    }
}

class ButtonPlayActionHandle implements ActionListener {

    public void actionPerformed(ActionEvent e) {
        //resetGame();
    }
}

I have problem with NoughtsAndCrossesGame which the play button doesn't work which i couldn't write the play button function code. The rest works but the play button doesn't work used to restart the button. i will good if someone give me a solution so that i could understand. thank you for kindness