用Java编写五子棋小游戏

好的，我可以为你提供一个简单的Java五子棋小游戏的代码示例，以供参考：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class GobangGame extends JFrame {
    private static final long serialVersionUID = 1L;
    private final int MARGIN = 30; // 棋盘边距
    private final int GRID_SPAN = 35; // 网格间距
    private final int ROWS = 15; // 棋盘行数
    private final int COLS = 15; // 棋盘列数
    private final int MAX_STEPS = ROWS * COLS; // 最大步数
    private int[][] chessBoard = new int[ROWS][COLS]; // 棋盘数组
    private boolean isBlack = true; // 黑棋先手
    private boolean gameOver = false; // 游戏结束标志
    private int xIndex = -1, yIndex = -1; // 当前下子的位置

    public GobangGame() {
        setTitle("Java五子棋小游戏");
        setSize(600, 600);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);
        ChessBoard chessBoardPanel = new ChessBoard();
        add(chessBoardPanel);
        setVisible(true);
    }

    // 重写paint方法，绘制棋盘和棋子
    public void paint(Graphics g) {
        super.paint(g);
        // 绘制棋盘
        for (int i = 0; i < ROWS; i++) {
            g.drawLine(MARGIN, MARGIN + i * GRID_SPAN, MARGIN + (COLS - 1) * GRID_SPAN, MARGIN + i * GRID_SPAN);
            g.drawLine(MARGIN + i * GRID_SPAN, MARGIN, MARGIN + i * GRID_SPAN, MARGIN + (ROWS - 1) * GRID_SPAN);
        }
        // 绘制棋子
        for (int i = 0; i < ROWS; i++) {
            for (int j = 0; j < COLS; j++) {
                if (chessBoard[i][j] == 1) {
                    g.setColor(Color.BLACK);
                    g.fillOval(MARGIN + i * GRID_SPAN - 15, MARGIN + j * GRID_SPAN - 15, 30, 30);
                } else if (chessBoard[i][j] == 2) {
                    g.setColor(Color.WHITE);
                    g.fillOval(MARGIN + i * GRID_SPAN - 15, MARGIN + j * GRID_SPAN - 15, 30, 30);
                }
            }
        }
    }

    // 判断是否胜利
    private boolean checkWin(int[][] arr, int x, int y) {
        int count = 1;
        // 水平方向
        for (int i = x - 1; i >= 0; i--) {
            if (arr[i][y] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1; i < ROWS; i++) {
            if (arr[i][y] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }
        // 垂直方向
        count = 1;
        for (int i = y - 1; i >= 0; i--) {
            if (arr[x][i] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        for (int i = y + 1; i < COLS; i++) {
            if (arr[x][i] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }
        // 左上到右下方向
        count = 1;
        for (int i = x - 1, j = y - 1; i >= 0 && j >= 0; i--, j--) {
            if (arr[i][j] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y + 1; i < ROWS && j < COLS; i++, j++) {
            if (arr[i][j] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }
        // 右上到左下方向
        count = 1;
        for (int i = x - 1, j = y + 1; i >= 0 && j < COLS; i--, j++) {
            if (arr[i][j] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y - 1; i < ROWS && j >= 0; i++, j--) {
            if (arr[i][j] == arr[x][y]) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }
        return false;
    }

    // 内部类，表示棋盘面板
    class ChessBoard extends JPanel {
        private static final long serialVersionUID = 1L;

        public ChessBoard() {
            setBackground(new Color(255, 216, 185));
            addMouseListener(new ChessBoardListener());
        }

        // 重写paintComponent方法，绘制棋盘和棋子
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            // 绘制棋盘
            for (int i = 0; i < ROWS; i++) {
                g.drawLine(MARGIN, MARGIN + i * GRID_SPAN, MARGIN + (COLS - 1) * GRID_SPAN, MARGIN + i * GRID_SPAN);
                g.drawLine(MARGIN + i * GRID_SPAN, MARGIN, MARGIN + i * GRID_SPAN, MARGIN + (ROWS - 1) * GRID_SPAN);
            }
            // 绘制棋子
            for (int i = 0; i < ROWS; i++) {
                for (int j = 0; j < COLS; j++) {
                    if (chessBoard[i][j] == 1) {
                        g.setColor(Color.BLACK);
                        g.fillOval(MARGIN + i * GRID_SPAN - 15, MARGIN + j * GRID_SPAN - 15, 30, 30);
                    } else if (chessBoard[i][j] == 2) {
                        g.setColor(Color.WHITE);
                        g.fillOval(MARGIN + i * GRID_SPAN - 15, MARGIN + j * GRID_SPAN - 15, 30, 30);
                    }
                }
            }
        }
    }

    // 内部类，表示棋盘鼠标监听器
    class ChessBoardListener extends MouseAdapter {
        public void mouseClicked(MouseEvent e) {
            if (gameOver) {
                return;
            }
            int xPos = e.getX();
            int yPos = e.getY();
            int xIndex = Math.round((float) (xPos - MARGIN) / GRID_SPAN);
            int yIndex = Math.round((float) (yPos - MARGIN) / GRID_SPAN);
            if (xIndex < 0 || xIndex >= ROWS || yIndex < 0 || yIndex >= COLS) {
                return;
            }
            if (chessBoard[xIndex][yIndex] != 0) {
                return;
            }
            chessBoard[xIndex][yIndex] = isBlack ? 1 : 2;
            if (checkWin(chessBoard, xIndex, yIndex)) {
                gameOver = true;
                String msg = String.format("%s赢了！", isBlack ? "黑棋" : "白棋");
                JOptionPane.showMessageDialog(null, msg);
            } else if (++xIndex * ++yIndex >= MAX_STEPS) { // 判断是否平局
                gameOver = true;
                JOptionPane.showMessageDialog(null, "平局！");
            }
            isBlack = !isBlack;
            repaint();
        }
    }

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

该示例代码使用了Java的Swing GUI库，实现了一个简单的五子棋小游戏。在此示例中，我们使用了一个`JFrame`窗口，将一个自定义的`JPanel`面板添加到窗口中，并在面板中绘制棋盘和棋子。同时，我们还为面板添加了一个鼠标监听器，用于处理玩家下棋的事件，并实现了判断胜负的逻辑。