利用java编写一个五子棋程序，程序包括Chess，Chessboard，Gamemain

以下是Java实现五子棋程序的示例代码：

1. Chess类

public class Chess {
    private int x;
    private int y;
    private int color; // 0表示黑子，1表示白子

    public Chess(int x, int y, int color) {
        this.x = x;
        this.y = y;
        this.color = color;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public int getColor() {
        return color;
    }

    public void setColor(int color) {
        this.color = color;
    }
}

2. Chessboard类

public class Chessboard {
    private int[][] board; // 棋盘
    private int size; // 棋盘大小
    private int turn; // 轮到哪一方下棋，0表示黑子，1表示白子
    private int count; // 已下棋子数量
    private List<Chess> history; // 棋谱

    public Chessboard(int size) {
        this.size = size;
        board = new int[size][size];
        turn = 0;
        count = 0;
        history = new ArrayList<>();
    }

    public boolean canPut(int x, int y) {
        return board[x][y] == 0;
    }

    public void putChess(int x, int y) {
        Chess chess = new Chess(x, y, turn);
        board[x][y] = turn + 1;
        history.add(chess);
        turn = 1 - turn;
        count++;
    }

    public boolean checkWin(int x, int y) {
        int color = board[x][y];
        int count = 1;
        int i, j;

        // 横向
        for (i = x - 1; i >= 0 && board[i][y] == color; i--, count++);
        for (i = x + 1; i < size && board[i][y] == color; i++, count++);
        if (count >= 5) {
            return true;
        }

        // 纵向
        count = 1;
        for (j = y - 1; j >= 0 && board[x][j] == color; j--, count++);
        for (j = y + 1; j < size && board[x][j] == color; j++, count++);
        if (count >= 5) {
            return true;
        }

        // 左上到右下
        count = 1;
        for (i = x - 1, j = y - 1; i >= 0 && j >= 0 && board[i][j] == color; i--, j--, count++);
        for (i = x + 1, j = y + 1; i < size && j < size && board[i][j] == color; i++, j++, count++);
        if (count >= 5) {
            return true;
        }

        // 右上到左下
        count = 1;
        for (i = x - 1, j = y + 1; i >= 0 && j < size && board[i][j] == color; i--, j++, count++);
        for (i = x + 1, j = y - 1; i < size && j >= 0 && board[i][j] == color; i++, j--, count++);
        if (count >= 5) {
            return true;
        }

        return false;
    }

    public boolean isFull() {
        return count == size * size;
    }

    public int[][] getBoard() {
        return board;
    }

    public List<Chess> getHistory() {
        return history;
    }

    public int getTurn() {
        return turn;
    }
}

3. Gamemain类

import java.util.Scanner;

public class Gamemain {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入棋盘大小：");
        int size = scanner.nextInt();
        Chessboard chessboard = new Chessboard(size);

        while (true) {
            System.out.print("请输入下棋的坐标（x,y）：");
            int x = scanner.nextInt();
            int y = scanner.nextInt();

            if (x < 0 || x >= size || y < 0 || y >= size) {
                System.out.println("坐标不合法，请重新输入！");
                continue;
            }

            if (!chessboard.canPut(x, y)) {
                System.out.println("该位置已有棋子，请重新输入！");
                continue;
            }

            chessboard.putChess(x, y);
            printBoard(chessboard.getBoard());

            if (chessboard.checkWin(x, y)) {
                System.out.println("恭喜" + (chessboard.getTurn() == 1 ? "白方" : "黑方") + "获胜！");
                break;
            }

            if (chessboard.isFull()) {
                System.out.println("平局！");
                break;
            }
        }
    }

    public static void printBoard(int[][] board) {
        int size = board.length;
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                switch (board[i][j]) {
                    case 0:
                        System.out.print("● ");
                        break;
                    case 1:
                        System.out.print("○ ");
                        break;
                    default:
                        System.out.print("+ ");
                        break;
                }
            }
            System.out.println();
        }
    }
}

运行程序后，输入棋盘大小，然后输入下棋的坐标就可以开始游戏了。棋盘上用黑子和白子分别表示两方，空位用加号表示。游戏结束后会显示胜利方或平局。