JavaTicTacToe/TicTacToe.java at main · XEHIL/JavaTicTacToe · GitHub

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import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class TicTacToe {
    static ArrayList<Integer> player1Positions = new ArrayList<Integer>();
    static ArrayList<Integer> player2Positions = new ArrayList<Integer>();
    public static void main(String args[]){
        char[][] gameBoard = {{' ', '|', ' ', '|', ' '},{'-', '+', '-', '+', '-'},{' ', '|', ' ', '|', ' '},{'-', '+', '-', '+', '-'},{' ', '|', ' ', '|', ' '}};
        printGameBoard(gameBoard);
        String result = "";
        while(true) {
            Scanner scan = new Scanner(System.in);
            System.out.println("[X] PLAYER1 Enter Position (1-9):");
            int pos1 = scan.nextInt();
            while (player1Positions.contains(pos1) || player2Positions.contains(pos1)){
                System.out.println("Position taken! Enter a correct position: ");
                pos1 = scan.nextInt();
            }
            placePiece(gameBoard, pos1, "player1");
            printGameBoard(gameBoard);
            result = checkWinner();
            if(result.length() > 0){
                System.out.println(result);
                printGameBoard(gameBoard);
                break;
            }
            System.out.println("[O] PLAYER2 Enter Position (1-9):");
            int pos2 = scan.nextInt();
            while (player1Positions.contains(pos2) || player2Positions.contains(pos2)){
                System.out.println("Position taken! Enter a correct position: ");
                pos2 = scan.nextInt();
            }
            placePiece(gameBoard, pos2, "player2");
            printGameBoard(gameBoard);
            result = checkWinner();
            if(result.length() > 0){
                System.out.println(result);
                printGameBoard(gameBoard);
                break;
            }
        }
    }
    public static void printGameBoard(char[][] gameBoard){
        for(char[] row: gameBoard){
            for(char c : row){
                System.out.print(c);
            }
            System.out.println();
        }
    }
    public static void placePiece(char[][] gameBoard, int pos, String user){
        char symbol = ' ';
        if(user.equals("player1")){
            symbol = 'X';
            player1Positions.add(pos);
        } else if (user.equals("player2")){
            symbol = 'O';
            player2Positions.add(pos);
        }
        switch (pos){
            case 1:
                gameBoard[0][0] = symbol;
                break;
            case 2:
                gameBoard[0][2] = symbol;
                break;
            case 3:
                gameBoard[0][4] = symbol;
                break;
            case 4:
                gameBoard[2][0] = symbol;
                break;
            case 5:
                gameBoard[2][2] = symbol;
                break;
            case 6:
                gameBoard[2][4] = symbol;
                break;
            case 7:
                gameBoard[4][0] = symbol;
                break;
            case 8:
                gameBoard[4][2] = symbol;
                break;
            case 9:
                gameBoard[4][4] = symbol;
                break;
            default:
                break;
        }
    }
    public static String checkWinner() {
        List topRow = Arrays.asList(1,2,3);
        List midRow = Arrays.asList(4,5,6);
        List botRow = Arrays.asList(7,8,9);
        List leftCol = Arrays.asList(1,4,7);
        List midCol = Arrays.asList(2,5,8);
        List rightCol = Arrays.asList(3,6,9);
        List cross1 = Arrays.asList(1,5,9);
        List cross2 = Arrays.asList(3,5,7);

        List<List> winning = new ArrayList<List>();
        winning.add(topRow);
        winning.add(midRow);
        winning.add(botRow);
        winning.add(leftCol);
        winning.add(midCol);
        winning.add(rightCol);
        winning.add(cross1);
        winning.add(cross2);

            for(List l: winning){
                if(player1Positions.containsAll(l)){
                    return "<---PLAYER1 WON--->";
                } else if(player2Positions.containsAll(l)) {
                    return "<---PLAYER2 WON--->";
                } else if(player1Positions.size() + player2Positions.size() == 9){
                    System.out.println("<---DRAW--->");
                    System.exit(0);
                }
            }
            return "";
    }
}