1.创建15*15的二维数组，初始化 char[][]

package twoDimArrayDemo;

import java.util.Arrays;
import java.util.Scanner;

public class Gobang {

//创建棋盘二维数组
static char[][] checkerboard = new char[15][15];
//定义一个标记flag。true-黑棋，false-白棋
static boolean flag = true;
//定义黑棋样式
static char black = ‘★’;
//定义白棋样式
static char white = ‘☆’;
static Scanner scanner = new Scanner(System.in);

//初始化棋盘
public static void init() {
    //创建数组num，为棋盘进行边界行列赋值
    char[] num = {'⒈', '⒉', '⒊', '⒋', '⒌', '⒍', '⒎', '⒏', '⒐', '⒑', '⒒', '⒓', '⒔', '⒕', '⒖'};
    //初始化数组
    for (int i = 0; i < checkerboard.length; i++) {
        for (int j = 0; j < checkerboard[i].length; j++) {
            checkerboard[i][j] = '十';
            //把棋盘最后一列的'十'替换为num数组中的元素
            if (j == checkerboard[i].length - 1) {
                checkerboard[i][j] = num[i];
            }
            //把棋盘最后一行的'十'替换为num数组中的元素
            if (i == checkerboard[j].length - 1) {
                checkerboard[i][j] = num[j];
            }
        }
    }
}

//判断坐标是否越界
public static boolean checkPointCross(int x, int y) {
    if (x < 0 || x > 13 || y < 0 || y > 13) {
        return false;
    }
    return true;
}

//判断坐标处是否已有棋子
public static boolean checkPointExit(int x, int y) {
    if (checkerboard[x - 1][y - 1] != '十') {
        return false;
    }
    return true;
}

//开始下棋
public static void playChess() {
    while (true) {
        if (flag) {
            System.out.println("黑棋下子：");
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            if (Gobang.checkPointCross(x, y) || Gobang.checkPointExit(x, y)) {
                checkerboard[x - 1][y - 1] = black;
                //下棋之后打印棋盘
                Gobang.print();
                

            } else {
                System.out.println("坐标越界或坐标处已有棋子！");
                continue;
            }
            flag = false;
        } else {
            System.out.println("白棋下子：");
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            if (Gobang.checkPointCross(x, y) && Gobang.checkPointExit(x, y)) {
                checkerboard[x - 1][y - 1] = white;
                //下棋之后打印棋盘
                Gobang.print();
            } else {
                System.out.println("坐标越界或坐标处已有棋子！");
                continue;
            }
            flag = true;
        }
    }
}

//打印输出棋盘
public static void print() {
    //输出棋盘
    for (int i = 0; i < checkerboard.length; i++) {
        for (int j = 0; j < checkerboard[i].length; j++) {
            System.out.print(checkerboard[i][j]);
        }
        System.out.println();
    }
}

}