用java写一个五子棋程序

好的，以下是一个简单的五子棋程序的Java代码：

import java.util.Scanner;

public class FiveChessGame {
    private static final int BOARD_SIZE = 15; // 棋盘大小
    private static final char BLACK_CHESS = '●'; // 黑棋
    private static final char WHITE_CHESS = '○'; // 白棋

    private char[][] board; // 棋盘
    private boolean blackTurn; // 轮到黑棋下了吗

    public FiveChessGame() {
        board = new char[BOARD_SIZE][BOARD_SIZE];
        blackTurn = true;
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                board[i][j] = '╋'; // 初始化棋盘
            }
        }
    }

    public void start() {
        System.out.println("欢迎来玩五子棋！");

        Scanner scanner = new Scanner(System.in);
        while (true) {
            printBoard();
            if (isGameOver()) {
                break;
            }

            char chess = blackTurn ? BLACK_CHESS : WHITE_CHESS;
            System.out.print("请" + (blackTurn ? "黑" : "白") + "方下棋（格式：x y）：");
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            if (!isValidMove(x, y)) {
                System.out.println("无效的落子，请重新输入！");
                continue;
            }
            board[x][y] = chess;
            blackTurn = !blackTurn;
        }

        printBoard();
        System.out.println("游戏结束！");
    }

    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++) {
                System.out.print(board[i][j] + " ");
            }
            System.out.println();
        }
    }

    private boolean isGameOver() {
        if (hasWon(BLACK_CHESS)) {
            System.out.println("黑方胜利！");
            return true;
        } else if (hasWon(WHITE_CHESS)) {
            System.out.println("白方胜利！");
            return true;
        } else if (isFull()) {
            System.out.println("平局！");
            return true;
        } else {
            return false;
        }
    }

    private boolean hasWon(char chess) {
        // 检查每一行
        for (int i = 0; i < BOARD_SIZE; i++) {
            int count = 0;
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == chess) {
                    count++;
                    if (count == 5) {
                        return true;
                    }
                } else {
                    count = 0;
                }
            }
        }

        // 检查每一列
        for (int i = 0; i < BOARD_SIZE; i++) {
            int count = 0;
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[j][i] == chess) {
                    count++;
                    if (count == 5) {
                        return true;
                    }
                } else {
                    count = 0;
                }
            }
        }

        // 检查正对角线
        for (int i = 0; i < BOARD_SIZE - 4; i++) {
            for (int j = 0; j < BOARD_SIZE - 4; j++) {
                int count = 0;
                for (int k = 0; k < 5; k++) {
                    if (board[i+k][j+k] == chess) {
                        count++;
                        if (count == 5) {
                            return true;
                        }
                    } else {
                        break;
                    }
                }
            }
        }

        // 检查反对角线
        for (int i = 0; i < BOARD_SIZE - 4; i++) {
            for (int j = 4; j < BOARD_SIZE; j++) {
                int count = 0;
                for (int k = 0; k < 5; k++) {
                    if (board[i+k][j-k] == chess) {
                        count++;
                        if (count == 5) {
                            return true;
                        }
                    } else {
                        break;
                    }
                }
            }
        }

        return false;
    }

    private boolean isFull() {
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == '╋') {
                    return false;
                }
            }
        }
        return true;
    }

    private boolean isValidMove(int x, int y) {
        return x >= 0 && x < BOARD_SIZE && y >= 0 && y < BOARD_SIZE && board[x][y] == '╋';
    }
}

你可以在 `main` 方法中创建一个 `FiveChessGame` 对象并调用 `start` 方法来开始游戏。例如：

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

在游戏中，你需要输入一个坐标来下棋。例如，如果你想在第3行第4列下黑棋，可以输入 `2 3`。如果输入的坐标无效（例如超出了棋盘范围或已经有棋子了），程序会提示你重新输入。