帮我写一个五子棋的Java代码

好的，以下是一个简单的五子棋Java代码，供您参考：

import java.util.Scanner;

public class GobangGame {
    // 棋盘大小
    private static final int BOARD_SIZE = 15;
    // 空位
    private static final int EMPTY = 0;
    // 黑子
    private static final int BLACK = 1;
    // 白子
    private static final int WHITE = 2;

    // 棋盘
    private int[][] board = new int[BOARD_SIZE][BOARD_SIZE];

    // 当前下棋方
    private int playSide = BLACK;

    // 读取用户输入
    private Scanner scanner = new Scanner(System.in);

    // 游戏开始
    public void start() {
        // 初始化棋盘
        initBoard();

        // 开始下棋
        while (true) {
            // 打印棋盘
            printBoard();

            // 读取用户输入
            System.out.println("请 " + (playSide == BLACK ? "黑方" : "白方") + " 下棋：");
            int x = scanner.nextInt();
            int y = scanner.nextInt();

            // 判断落子是否合法
            if (x < 0 || x >= BOARD_SIZE || y < 0 || y >= BOARD_SIZE) {
                System.out.println("落子位置不合法，请重新输入！");
                continue;
            }
            if (board[x][y] != EMPTY) {
                System.out.println("该位置已经落子，请重新输入！");
                continue;
            }

            // 下棋
            board[x][y] = playSide;

            // 判断是否获胜
            if (isWin(x, y)) {
                System.out.println((playSide == BLACK ? "黑方" : "白方") + " 获胜！");
                break;
            }

            // 判断是否平局
            if (isDraw()) {
                System.out.println("平局！");
                break;
            }

            // 切换下棋方
            playSide = (playSide == BLACK ? WHITE : BLACK);
        }
    }

    // 初始化棋盘
    private void initBoard() {
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                board[i][j] = EMPTY;
            }
        }
    }

    // 打印棋盘
    private void printBoard() {
        System.out.print(" ");
        for (int i = 0; i < BOARD_SIZE; i++) {
            System.out.print(i);
        }
        System.out.println();
        for (int i = 0; i < BOARD_SIZE; i++) {
            System.out.print(i);
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == EMPTY) {
                    System.out.print("+");
                } else if (board[i][j] == BLACK) {
                    System.out.print("●");
                } else {
                    System.out.print("○");
                }
            }
            System.out.println();
        }
    }

    // 判断是否获胜
    private boolean isWin(int x, int y) {
        // 判断横向是否连成五个
        int count = 1;
        for (int i = x - 1; i >= 0; i--) {
            if (board[i][y] == playSide) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1; i < BOARD_SIZE; i++) {
            if (board[i][y] == playSide) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        // 判断纵向是否连成五个
        count = 1;
        for (int i = y - 1; i >= 0; i--) {
            if (board[x][i] == playSide) {
                count++;
            } else {
                break;
            }
        }
        for (int i = y + 1; i < BOARD_SIZE; i++) {
            if (board[x][i] == playSide) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        // 判断左斜线是否连成五个
        count = 1;
        for (int i = x - 1, j = y - 1; i >= 0 && j >= 0; i--, j--) {
            if (board[i][j] == playSide) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y + 1; i < BOARD_SIZE && j < BOARD_SIZE; i++, j++) {
            if (board[i][j] == playSide) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        // 判断右斜线是否连成五个
        count = 1;
        for (int i = x - 1, j = y + 1; i >= 0 && j < BOARD_SIZE; i--, j++) {
            if (board[i][j] == playSide) {
                count++;
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y - 1; i < BOARD_SIZE && j >= 0; i++, j--) {
            if (board[i][j] == playSide) {
                count++;
            } else {
                break;
            }
        }
        if (count >= 5) {
            return true;
        }

        return false;
    }

    // 判断是否平局
    private boolean isDraw() {
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == EMPTY) {
                    return false;
                }
            }
        }
        return true;
    }
}

使用方法：

public class Main {
    public static void main(String[] args) {
        GobangGame game = new GobangGame();
        game.start();
    }
}

运行后，程序会要求您输入棋子的坐标，先输入横坐标，再输入纵坐标，用空格隔开。例如，输入 `7 7` 表示在第 7 行、第 7 列下棋。