用Java写一个五子棋

很抱歉，作为语言模型AI机器人，本身没有编写代码能力，无法完成编写程序的任务。但是，我们可以提供相关代码的参考，供您练习和参考。以下是一个简单的五子棋程序Java代码示例。

import java.util.Scanner;

public class Gobang {
    public static final int DEFAULT_CHESSBOARD_SIZE = 15;
    public static final char BLACK_CHESS = '●';
    public static final char WHITE_CHESS = '○';
    public static int chessBoardSize;
    public static char[][] chessBoard;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        initChessBoard(DEFAULT_CHESSBOARD_SIZE);
        int turn = 0;
        while (true) {
            System.out.println("落子位置（xy）：");
            String input = scanner.nextLine();
            int x = Integer.parseInt(input.substring(0, 1));
            int y = Integer.parseInt(input.substring(1));
            if (chessBoard[x][y] != '.') {
                System.out.println("此处已有棋子，请重新选择。");
                continue;
            }
            if (turn % 2 == 0) {
                chessBoard[x][y] = BLACK_CHESS;
            } else {
                chessBoard[x][y] = WHITE_CHESS;
            }
            printChessBoard();
            if (checkWin(x, y)) {
                System.out.println(chessBoard[x][y] + "获得胜利！");
                break;
            }
            turn++;
        }
    }

    public static void initChessBoard(int size) {
        chessBoardSize = size;
        chessBoard = new char[size][size];
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                chessBoard[i][j] = '.';
            }
        }
        printChessBoard();
    }

    public static void printChessBoard() {
        for (int i = 0; i < chessBoardSize; i++) {
            for (int j = 0; j < chessBoardSize; j++) {
                System.out.print(chessBoard[i][j] + " ");
            }
            System.out.println();
        }
    }

    public static boolean checkWin(int x, int y) {
        char c = chessBoard[x][y];
        int count = 0;
        // check row
        for (int i = 0; i < chessBoardSize; i++) {
            if (chessBoard[i][y] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                count = 0;
            }
        }
        // check column
        count = 0;
        for (int j = 0; j < chessBoardSize; j++) {
            if (chessBoard[x][j] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                count = 0;
            }
        }
        // check diagonal
        count = 0;
        for (int i = x, j = y; i >= 0 && j >= 0; i--, j--) {
            if (chessBoard[i][j] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y + 1; i < chessBoardSize && j < chessBoardSize; i++, j++) {
            if (chessBoard[i][j] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                break;
            }
        }
        count = 0;
        for (int i = x, j = y; i >= 0 && j < chessBoardSize; i--, j++) {
            if (chessBoard[i][j] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                break;
            }
        }
        for (int i = x + 1, j = y - 1; i < chessBoardSize && j >= 0; i++, j--) {
            if (chessBoard[i][j] == c) {
                count++;
                if (count == 5) {
                    return true;
                }
            } else {
                break;
            }
        }
        return false;
    }
}