自己的五子棋版本1.1

五子棋是一个简单的游戏，游戏规则也是很简单。
1、黑白棋子轮流下，黑子先行
2、相同颜色五子连成一行胜出。

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
/**
 * Description:
 * 
网站: 疯狂Java联盟 
 * 
Copyright (C), 2001-2012, Yeeku.H.Lee
 * 
This program is protected by copyright laws.
 * 
Program Name:
 * 
Date:
 * @author Yeeku.H.Lee [email protected]
 * @version 1.0
 */
public class Gobang
{
    // 下面三个位图分别代表棋盘、黑子、白子
    BufferedImage table;
    BufferedImage black;
    BufferedImage white;
    // 当鼠标移动时候的选择框
    BufferedImage selected;
    //一个人不能连着走
    private static  long n = -1;
    // 定义棋盘的大小
    private static int BOARD_SIZE = 15;
    // 定义棋盘宽、高多少个像素
    private final int TABLE_WIDTH = 535;
    private final int TABLE_HETGHT = 536;
    // 定义棋盘坐标的像素值和棋盘数组之间的比率。
    private final int RATE = TABLE_WIDTH / BOARD_SIZE;
    // 定义棋盘坐标的像素值和棋盘数组之间的偏移距。
    private final int X_OFFSET = 5;
    private final int Y_OFFSET = 6;
    // 定义一个二维数组来充当棋盘
    private String[][] board = new String[BOARD_SIZE][BOARD_SIZE];
    // 五子棋游戏的窗口
    JFrame f = new JFrame("五子棋游戏");
    // 五子棋游戏棋盘对应的Canvas组件
    ChessBoard chessBoard = new ChessBoard();
    // 当前选中点的坐标
    private int selectedX = -1;
    private int selectedY = -1;
    public void init()throws Exception
    {
        table = ImageIO.read(new File("image/board.jpg"));
        black = ImageIO.read(new File("image/black.gif"));
        white = ImageIO.read(new File("image/white.gif"));
        selected = ImageIO.read(new File("image/selected.gif"));
        // 把每个元素赋为"╋"，"╋"代表没有棋子
        for (int i = 0 ; i < BOARD_SIZE ; i++)
        {
            for ( int j = 0 ; j < BOARD_SIZE ; j++)
            {
                board[i][j] = "╋";
            }
        }
        chessBoard.setPreferredSize(new Dimension(
            TABLE_WIDTH , TABLE_HETGHT));
        chessBoard.addMouseListener(new MouseAdapter()
        {
            public void mouseClicked(MouseEvent e)
            {
                // 将用户鼠标事件的坐标转换成棋子数组的坐标。
                int xPos = (int)((e.getX() - X_OFFSET) / RATE);
                int yPos = (int)((e.getY() - Y_OFFSET ) / RATE);
                if(n%2！=0&&board[xPos][yPos]=="╋")
                {
                    board[xPos][yPos] = "●";
                    n++;
                }
                else {
                    board[xPos][yPos] = "○";
                    n++;
                }
                /*
                电脑随机生成两个整数，作为电脑下棋的坐标，赋给board数组。
                还涉及:
                1.如果下棋的点已经有棋子，不能重复下棋。
                2.每次下棋后，需要扫描谁赢了
                */
                chessBoard.repaint();
            }
            // 当鼠标退出棋盘区后，复位选中点坐标
            public void mouseExited(MouseEvent e)
            {
                selectedX = -1;
                selectedY = -1;
                chessBoard.repaint();
            }
        });
        chessBoard.addMouseMotionListener(new MouseMotionAdapter()
        {
        // 当鼠标移动时，改变选中点的坐标
        public void mouseMoved(MouseEvent e)
        {
        selectedX = (e.getX() - X_OFFSET) / RATE;
        selectedY = (e.getY() - Y_OFFSET) / RATE;
        chessBoard.repaint();
        }
        });
        f.add(chessBoard);
        f.pack();
        f.setVisible(true);
    }
    public static void main(String[] args)throws Exception
    {
        Gobang gb = new Gobang();
        gb.init();
    }
    class ChessBoard extends JPanel
    {
        // 重写JPanel的paint方法，实现绘画
        public void paint(Graphics g)
        {
            // 将绘制五子棋棋盘
            g.drawImage(table , 0 , 0 , null);
            // 绘制选中点的红框
            if (selectedX >= 0 && selectedY >= 0)
                g.drawImage(selected , selectedX * RATE + X_OFFSET , 
            selectedY * RATE + Y_OFFSET, null);
            // 遍历数组，绘制棋子。
            for (int i = 0 ; i < BOARD_SIZE ; i++)
            {
                for ( int j = 0 ; j < BOARD_SIZE ; j++)
                {
                    // 绘制黑棋
                    if (board[i][j].equals("●"))
                    {
                        g.drawImage(black , i * RATE + X_OFFSET
                            , j * RATE + Y_OFFSET, null);
                    }
                    // 绘制白棋
                    if (board[i][j].equals("○"))
                    {
                        g.drawImage(white, i * RATE  + X_OFFSET
                            , j * RATE  + Y_OFFSET, null);
                    }
                }
            }
        }
    }
}