TicTacToeFrame.java

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

public class TicTacToeFrame extends JFrame implements ActionListener {
  private JButton newGameButton = new JButton("New Game");
  private JButton exitButton = new JButton("Exit");
  private JButton[][] buttons = new JButton[3][3];
  private JLabel statusLabel = new JLabel();
  private String[] symbol = { " ", "O", "X" };

  private final int AI = 1;
  private final int PLAYER = 0;

  private boolean isWin;
  private int count;
  private int depth;
  private int turn;

  private TicTacToeMain main;

  public TicTacToeFrame(TicTacToeMain main) {
    this.main = main;
    JPanel aPanel = new JPanel();
    aPanel.add(newGameButton);
    aPanel.add(exitButton);
    newGameButton.addActionListener(this);
    exitButton.addActionListener(this);

    JPanel boardPanel = new JPanel();
    boardPanel.setLayout(new GridLayout(3, 3));
    for (int i = 0; i < buttons.length; i++) {
      for (int j = 0; j < buttons[0].length; j++) {
        buttons[i][j] = new JButton();
        buttons[i][j].addActionListener(this);
        boardPanel.add(buttons[i][j]);
      }
    }

    add(aPanel, BorderLayout.NORTH);
    add(boardPanel, BorderLayout.CENTER);
    add(statusLabel, BorderLayout.SOUTH);

    // TicTacToeMain.newGame();

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    pack();
  }

/*  public void newGame() {
    statusLabel.setText("Status: Player" + turn);

    for (int i = 0; i < buttons.length; i++) {
      for (int j = 0; j < buttons[0].length; j++) {
        buttons[i][j].setText(" ");
      }
    }
  }*/
  public void updateBoard(int[][] board) {
    for (int i = 0; i < buttons.length; i++) {
      for (int j = 0; j < buttons[0].length; j++) {
        buttons[i][j].setText(symbol[board[i][j]]);
      }
    }
  }

  public void actionPerformed(ActionEvent event) {
    if (event.getSource() == exitButton) {
      System.exit(0);
    }

    if (event.getSource() == newGameButton) {
      main.newGame();
    } else {

    }
  }
}

TicTacToeMain.java

/**
 * TicTacToeMain
 */

public class TicTacToeMain {
	private int[][] board = new int[3][3];
	private TicTacToeFrame frame;

	public TicTacToeMain() {
        frame = new TicTacToeFrame(this);
		frame.setVisible(true);
	}

	public void newGame() {
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				board[i][j] = 0;
			}
		}
		frame.updateBoard(board);
	}

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