java实现五子棋游戏可开始，认输，悔棋

好的，以下是Java实现五子棋游戏的示例代码，包括可开始、认输、悔棋等功能：

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

public class Gobang extends JFrame implements ActionListener, MouseListener {
    private static final long serialVersionUID = 1L;
    private JPanel mainPanel;
    private int[][] chessboard;
    private int currentPlayer;
    private JLabel statusLabel;
    private JButton restartButton;
    private JButton backButton;
    private int currentX;
    private int currentY;
    private int winner;

    public Gobang() {
        super("五子棋游戏");

        mainPanel = new JPanel(new GridLayout(15, 15));
        chessboard = new int[15][15];
        currentPlayer = 1;
        winner = 0;

        for (int i = 0; i < 15; i++) {
            for (int j = 0; j < 15; j++) {
                JPanel panel = new JPanel();
                panel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
                mainPanel.add(panel);
                panel.addMouseListener(this);
            }
        }

        statusLabel = new JLabel("当前玩家: " + currentPlayer);
        restartButton = new JButton("重新开始");
        backButton = new JButton("悔棋");

        JPanel bottomPanel = new JPanel(new GridLayout(1, 3));
        bottomPanel.add(statusLabel);
        bottomPanel.add(restartButton);
        bottomPanel.add(backButton);

        restartButton.addActionListener(this);
        backButton.addActionListener(this);

        add(mainPanel, BorderLayout.CENTER);
        add(bottomPanel, BorderLayout.SOUTH);
        pack();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == restartButton) {
            restart();
        } else if (e.getSource() == backButton) {
            if (currentPlayer != winner) {
                undo();
            }
        }
    }

    public void mouseClicked(MouseEvent e) {
        if (winner != 0) {
            return;
        }

        JPanel panel = (JPanel) e.getSource();
        int index = mainPanel.getComponentZOrder(panel);
        int x = index % 15;
        int y = index / 15;

        if (chessboard[x][y] != 0) {
            return;
        }

        currentX = x;
        currentY = y;

        chessboard[x][y] = currentPlayer;
        panel.setBackground(currentPlayer == 1 ? Color.BLACK : Color.WHITE);

        if (checkWin(x, y)) {
            winner = currentPlayer;
            statusLabel.setText("玩家 " + winner + " 获胜");
        } else {
            currentPlayer = currentPlayer == 1 ? 2 : 1;
            statusLabel.setText("当前玩家: " + currentPlayer);
        }
    }

    public void mousePressed(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}

    private boolean checkWin(int x, int y) {
        int count = 1;

        // 横向
        for (int i = x - 1; i >= 0; i--) {
            if (chessboard[i][y] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1; i < 15; i++) {
            if (chessboard[i][y] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        count = 1;

        // 纵向
        for (int i = y - 1; i >= 0; i--) {
            if (chessboard[x][i] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        for (int i = y + 1; i < 15; i++) {
            if (chessboard[x][i] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        count = 1;

        // 斜向
        for (int i = x - 1, j = y - 1; i >= 0 && j >= 0; i--, j--) {
            if (chessboard[i][j] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y + 1; i < 15 && j < 15; i++, j++) {
            if (chessboard[i][j] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        count = 1;

        // 反斜向
        for (int i = x - 1, j = y + 1; i >= 0 && j < 15; i--, j++) {
            if (chessboard[i][j] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y - 1; i < 15 && j >= 0; i++, j--) {
            if (chessboard[i][j] == currentPlayer) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        return false;
    }

    private void undo() {
        chessboard[currentX][currentY] = 0;
        Component component = mainPanel.getComponent(currentY * 15 + currentX);
        component.setBackground(null);
        currentPlayer = currentPlayer == 1 ? 2 : 1;
        statusLabel.setText("当前玩家: " + currentPlayer);
    }

    private void restart() {
        for (int i = 0; i < 15; i++) {
            for (int j = 0; j < 15; j++) {
                chessboard[i][j] = 0;
                Component component = mainPanel.getComponent(j * 15 + i);
                component.setBackground(null);
            }
        }
        currentPlayer = 1;
        winner = 0;
        statusLabel.setText("当前玩家: " + currentPlayer);
    }

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

这个代码会创建一个15x15的棋盘，玩家点击棋盘上的格子可以下棋。当有一方获胜时，会显示胜利信息；玩家可以点击“重新开始”按钮重新开始游戏，也可以点击“悔棋”按钮悔棋。