simple tick-tack-toe game

gistfile1.java

package com.practicaljava.lesson11;

import java.awt.Component;
import java.awt.Font;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.SwingConstants;

@SuppressWarnings("serial")
public class TicTacToeApplet extends JApplet implements MouseListener {
	private static final String PLAYERX = "Player X";
	private static final String PLAYERO = "Player O";
	private int moves = 0;

	private String playerName = PLAYERX;

	private javax.swing.JButton button1;
	private javax.swing.JButton button2;
	private javax.swing.JButton button3;
	private javax.swing.JButton button4;
	private javax.swing.JButton button5;
	private javax.swing.JButton button6;
	private javax.swing.JButton button7;
	private javax.swing.JButton button8;
	private javax.swing.JButton button9;
	private javax.swing.JLabel playerNumber;
	private java.awt.Panel buttonsPanel;

	public void init() {
		initComponents();
	}

	private void initComponents() {
		buttonsPanel = new java.awt.Panel();
		button1 = new javax.swing.JButton();
		button2 = new javax.swing.JButton();
		button3 = new javax.swing.JButton();
		button4 = new javax.swing.JButton();
		button5 = new javax.swing.JButton();
		button6 = new javax.swing.JButton();
		button7 = new javax.swing.JButton();
		button8 = new javax.swing.JButton();
		button9 = new javax.swing.JButton();
		playerNumber = new javax.swing.JLabel(playerName, SwingConstants.CENTER);

		buttonsPanel.setLayout(new java.awt.GridLayout(4, 3));

		buttonsPanel.add(button1);
		buttonsPanel.add(button2);
		buttonsPanel.add(button3);
		buttonsPanel.add(button4);
		buttonsPanel.add(button5);
		buttonsPanel.add(button6);
		buttonsPanel.add(button7);
		buttonsPanel.add(button8);
		buttonsPanel.add(button9);

		Font buttonFont = new Font("Times New Roman", Font.PLAIN, 60);
		for (Component component : buttonsPanel.getComponents()) {
			if (component instanceof JButton) {
				((JButton) component).addMouseListener(this);
				((JButton) component).setFont(buttonFont);
			}
		}

		setPlayerName(PLAYERX);
		buttonsPanel.add(playerNumber);

		add(buttonsPanel);
	}

	private void setPlayerName(String playerName) {
		this.playerName = playerName;
		playerNumber.setText(playerName + " your turn. ");
	}

	private void reset() {
		for (Component component : buttonsPanel.getComponents()) {
			if (component instanceof JButton) {
				((JButton) component).setText("");
			}
		}
		setPlayerName(PLAYERX);
		moves = 0;
	}

	public void checkForWinner() {
		String[] str = { "OK" };

		switch (findThreeInARow()) {
		case 1:
			String winnerName = (playerName == PLAYERX) ? PLAYERO : PLAYERX;

			JOptionPane.showOptionDialog(this,
					winnerName.concat(" won!!! Congratulations!!!"),
					"Congratulations!", JOptionPane.YES_OPTION,
					JOptionPane.PLAIN_MESSAGE, null, str, "OK");
			reset();
			break;
		case 3:
			JOptionPane.showOptionDialog(this, " ohh!!1 Tie!!! Try again!!!",
					"Try again!", JOptionPane.YES_OPTION,
					JOptionPane.PLAIN_MESSAGE, null, str, "OK");
			reset();
			break;

		default:
			break;
		}

	}

	public void mouseClicked(MouseEvent e) {
		javax.swing.JButton currentButton = (JButton) e.getComponent();
		if (currentButton.getText() == "") {
			if (playerName == PLAYERX) {
				currentButton.setText("X");
				setPlayerName(PLAYERO);
			} else if (playerName == PLAYERO) {
				currentButton.setText("O");
				setPlayerName(PLAYERX);
			}
		}
		moves++;
		checkForWinner();
	}

	public void mousePressed(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

	public void mouseEntered(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}
	
	private int findThreeInARow(){
	    if ((button1.getText() == button2.getText() && button2.getText() == button3.getText() && button1.getText() != "") ||
	    	(button4.getText() == button5.getText() && button5.getText() == button6.getText() && button4.getText() != "") || 
	        (button7.getText() == button8.getText() && button8.getText() == button9.getText() && button7.getText() != "") ||
            (button1.getText() == button4.getText() && button4.getText() == button7.getText() && button1.getText() != "") ||
            (button2.getText() == button5.getText() && button5.getText() == button8.getText() && button2.getText() != "") ||
            (button3.getText() == button6.getText() && button6.getText() == button9.getText() && button3.getText() != "") ||
            (button1.getText() == button5.getText() && button5.getText() == button9.getText() && button1.getText() != "") ||
            (button3.getText() == button5.getText() && button5.getText() == button7.getText() && button3.getText() != "")
        )
	        return 1;
	    else if (moves == 9) return 3;
	    else
	        return 0;
    }
}