写出一个可以下五子棋的java代码

以下是一个简单的可以下五子棋的 Java 代码，使用 Swing GUI 库：

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

public class Gomoku {
    private JButton[][] buttons;
    private int currentPlayer;

    public Gomoku() {
        JFrame frame = new JFrame("五子棋");
        frame.setSize(600, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel board = new JPanel(new GridLayout(15, 15));

        buttons = new JButton[15][15];
        for (int i = 0; i < 15; i++) {
            for (int j = 0; j < 15; j++) {
                JButton button = new JButton();
                button.setPreferredSize(new Dimension(30, 30));
                button.addActionListener(new ButtonListener(i, j));
                board.add(button);
                buttons[i][j] = button;
            }
        }

        frame.getContentPane().add(board);
        frame.setVisible(true);

        currentPlayer = 1;
    }

    private void makeMove(int row, int col) {
        if (buttons[row][col].getText().equals("")) {
            if (currentPlayer == 1) {
                buttons[row][col].setText("●");
            } else {
                buttons[row][col].setText("○");
            }

            if (checkWin(row, col)) {
                JOptionPane.showMessageDialog(null, "Player " + currentPlayer + " wins!");
                System.exit(0);
            }

            currentPlayer = 3 - currentPlayer; // 切换玩家
        }
    }

    private boolean checkWin(int row, int col) {
        String symbol = (currentPlayer == 1) ? "●" : "○";

        // 检查行
        int count = 0;
        for (int i = 0; i < 15; i++) {
            if (buttons[row][i].getText().equals(symbol)) {
                count++;
                if (count == 5) return true;
            } else {
                count = 0;
            }
        }

        // 检查列
        count = 0;
        for (int i = 0; i < 15; i++) {
            if (buttons[i][col].getText().equals(symbol)) {
                count++;
                if (count == 5) return true;
            } else {
                count = 0;
            }
        }

        // 检查对角线
        count = 0;
        for (int i = -4; i <= 4; i++) {
            int r = row + i;
            int c = col + i;
            if (r >= 0 && r < 15 && c >= 0 && c < 15 && buttons[r][c].getText().equals(symbol)) {
                count++;
                if (count == 5) return true;
            } else {
                count = 0;
            }
        }

        // 检查反对角线
        count = 0;
        for (int i = -4; i <= 4; i++) {
            int r = row + i;
            int c = col - i;
            if (r >= 0 && r < 15 && c >= 0 && c < 15 && buttons[r][c].getText().equals(symbol)) {
                count++;
                if (count == 5) return true;
            } else {
                count = 0;
            }
        }

        return false;
    }

    private class ButtonListener implements ActionListener {
        private int row, col;

        public ButtonListener(int row, int col) {
            this.row = row;
            this.col = col;
        }

        public void actionPerformed(ActionEvent e) {
            makeMove(row, col);
        }
    }

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

这个代码创建了一个 15x15 的五子棋棋盘，玩家可以通过点击按钮下棋子。程序会自动检查是否有五个棋子连成一线，如果有就弹出胜利提示。