Simple implementation of tic-tac-toe

TicTacToe.java

package tictactoe;

import java.util.Scanner;

public class Main {
    
    private static final int SELL_NUMBERS = 3;
    private static final int X_SUM = 264;
    private static final int O_SUM = 237;

    private static final String X_WINS = "X wins";
    private static final String O_WINS = "O wins";
    private static final String DRAW = "Draw";
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char[][] arr = new char[SELL_NUMBERS][SELL_NUMBERS];

        for (int i = 0; i < SELL_NUMBERS; i++) {
            for (int j = 0; j < SELL_NUMBERS; j++) {
                arr[i][j] = '_';
            }
        }

        printCells(arr);

        int characterChanger = 1;

        while (scanner.hasNext()) {
            String verticalCoordinate = scanner.next();
            String horizontalCoordinate = scanner.next();

            System.out.println("Enter the coordinates: " + verticalCoordinate + " " + horizontalCoordinate);

            try {
                int i = Integer.parseInt(verticalCoordinate);
                int j = Integer.parseInt(horizontalCoordinate);

                if (i <= SELL_NUMBERS && j <= SELL_NUMBERS) {
                    if (arr[i - 1][j - 1] != '_') {
                        System.out.println("This cell is occupied! Choose another one!");
                    } else if (characterChanger == 1) {
                        arr[i - 1][j - 1] = 'X';
                        characterChanger = 2;
                        printCells(arr);
                    } else {
                        arr[i - 1][j - 1] = 'O';
                        characterChanger = 1;
                        printCells(arr);
                    }
                } else {
                    System.out.println("Coordinates should be from 1 to 3!");
                }
            } catch (NumberFormatException exception) {
                System.out.println("You should enter numbers!");
            }

            switch (gameAnalyzer(arr)) {
                case X_WINS:
                    System.out.println(X_WINS);
                    return;
                case O_WINS:
                    System.out.println(O_WINS);
                    return;
                case DRAW:
                    System.out.println(DRAW);
                    return;
            }
        }
    }

    private static void printCells(char[][] arr) {
        System.out.println("---------");
        for (char[] elements : arr) {
            System.out.print("| ");
            for (char elem : elements) {
                System.out.print(elem + " ");
            }
            System.out.println("|");
        }
        System.out.println("---------");
    }

    private static String gameAnalyzer(char[][] arr) {
        int numberOfX = 0;
        int numberOfO = 0;

        int primaryDiagonalSum = 0;
        int secondaryDiagonalSum = 0;

        boolean xWin = false;
        boolean oWin = false;

        for (int i = 0; i < SELL_NUMBERS; i++) {
            int horizontalSum = 0;
            int verticalSum = 0;
            for (int j = 0; j < SELL_NUMBERS; j++) {
                if (arr[i][j] == 'X') numberOfX++;
                if (arr[i][j] == 'O') numberOfO++;
                if (i == j) primaryDiagonalSum += arr[i][j];
                if (i + j == SELL_NUMBERS - 1) secondaryDiagonalSum += arr[i][j];

                horizontalSum += arr[i][j];
                verticalSum += arr[j][i];
            }

            if (horizontalSum == X_SUM || verticalSum == X_SUM || primaryDiagonalSum == X_SUM || secondaryDiagonalSum == X_SUM) {
                xWin = true;
            } else if (horizontalSum == O_SUM || verticalSum == O_SUM || primaryDiagonalSum == O_SUM || secondaryDiagonalSum == O_SUM) {
                oWin = true;
            }
        }

        if (xWin) {
            return X_WINS;
        } else if (oWin) {
            return O_WINS;
        } else if (numberOfX + numberOfO == 9) {
            return DRAW;
        }

        return "";
    }
}