How to finish the game tic-tac-toe?

Question

Java

Hey! I am writing a tic-tac-toe game program. I'm trying to make a check for winnings, and tried this way and that. Below is my program and "check win" check. BUT for some reason my variables 'player' and 'computer' are now underlined. I'm already completely lost. Help. And if you know how else to check can be done ...

import java.util.Scanner;
import java.util.Random;


public class Main {

    public static void main(String[] args) {
        System.out.println("Приветствую Вас!");
        System.out.println("Сыграем в крестики-нолики?");
        System.out.println("===============");
        initMap();
        printMap();
        while (true) {
            humanTurn();
            printMap();
            if (checkWin(player)) {
                System.out.println("Победил человек");
                break;
            }
            if (isMapFull()) {
                System.out.println("Ничья");
                break;
            }
            compTurn();
            printMap();
            if (checkWin(computer)) {
                System.out.println("Победил Искуственный Интеллект");
                break;
            }
            if (isMapFull()) {
                System.out.println("Ничья");
                break;
            }
        }
        System.out.println("Игра закончена");
    }



    public static char[][] map;
    public static int size = 3;
    public static int dots_for_win = 4;

    public static char space = '-';
    public static char player = 'O';
    public static char computer = 'X';
    public static Scanner sc = new Scanner(System.in);
    public static Random rand = new Random();



    static void initMap() {
            map = new char[size][size];
            for (int i = 0; i < size; i++) {
                for (int j = 0; j < size; j++) {
                    map[i][j] = space;
                }
            }
        }

        public static void printMap() {
            for (int i = 0; i <= size; i++) {
                System.out.print(i + " ");
            }
            System.out.println();
            for (int i = 0; i < size; i++) {
                System.out.print((i + 1) + " ");
                for (int j = 0; j < size; j++) {
                    System.out.print(map[i][j] + " ");
                }
                System.out.println();
            }
            System.out.println();
        }
        public static void humanTurn() {
            int x, y;
        do {
            System.out.println("Введите координаты в формате X Y");
            x = sc.nextInt() - 1;
            y = sc.nextInt() - 1;
        } while (!ValidCell(x, y));
        map[y][x] = computer;
    }


    public static void compTurn() {
        int x, y;
        do {
            x = rand.nextInt(size);
            y = rand.nextInt(size);
        } while (!ValidCell(x, y));
        System.out.println("Компьютер походил в точку " + (x + 1) + " " + (y + 1));
        map[y][x] = player;
    }





    public static boolean ValidCell(int x, int y) {
        if (x < 0 || x >= size || y < 0 || y >= size) return false;
        if (map[y][x] == space) return true;
        return false;
}







    private static boolean checkWin(String[][] desc) {
        return checkWinnerHorizontal(desc) ||
                checkWinnerVertical(desc) ||
                checkWinnerDiagonals(desc);
    }

    private static boolean checkWinnerHorizontal(String[][] desc) {
        return desc[0][0].equals(desc[1][0]) && desc[0][0].equals(desc[2][0]) ||
                desc[0][1].equals(desc[1][1]) && desc[0][1].equals(desc[2][1]) ||
                desc[0][2].equals(desc[1][2]) && desc[0][2].equals(desc[2][2]);
    }

    private static boolean checkWinnerVertical(String[][] desc) {
        return desc[0][0].equals(desc[0][1]) && desc[0][0].equals(desc[0][2]) ||
                desc[1][0].equals(desc[1][1]) && desc[1][0].equals(desc[1][2]) ||
                desc[2][0].equals(desc[2][1]) && desc[2][0].equals(desc[2][2]);
    }

    private static boolean checkWinnerDiagonals(String[][] desc) {
        return desc[0][0].equals(desc[1][1]) && desc[0][0].equals(desc[2][2]) ||
                desc[2][0].equals(desc[1][1]) && desc[2][0].equals(desc[0][2]);
    }


    public static boolean isMapFull() {
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                if (map[i][j] == space) return false;
            }
        }
        return true;
    }

}

Answer 1

1. Метод checkWin принимает String[][], а вы туда пытаетесь char засунуть.
2. Методы checkWinnerHorizontal, checkWinnerVertical, checkWinnerDiagonals, похоже проверяют равенство ячеек массива, но не его содержание. Т.е. нужно еще добавить проверку на равенство крестику или нолику.