java-university-practicals/TicTacToeVsComputer.java at main · Tavneetsingh01/java-university-practicals · GitHub

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import java.util.*;
/**
 * Refer https://github.com/giljr/java and
 * https://medium.com/jungletronics/tic-tac-toe-in-java-8fbd503a07e8
 * for more detail
 * @author Tavneet Singh
 */
public class TicTacToeVsComputer {

    static ArrayList<Integer> playerPositions = new ArrayList<Integer>();
    static ArrayList<Integer> cpuPositions = new ArrayList<Integer>();

    public static void main(String[] args) {
        char[][] gameBoard = {{' ', '|', ' ', '|', ' '},
                {'-', '-', '-', '-', '-'},
                {' ', '|', ' ', '|', ' '},
                {'-', '-', '-', '-', '-'},
                {' ', '|', ' ', '|', ' '}};
        System.out.println("Hello! player 1 First turn is yours.\nand your mark is \"X\"");
        printGameBoard(gameBoard);
        Scanner scan = new Scanner(System.in);
        while (true) {
            System.out.println("Enter your position (1-9):");
            int playerPos = scan.nextInt();
            while (playerPositions.contains(playerPos) || cpuPositions.contains(playerPos)) {
                System.out.println("position taken !  enter correct position");
                playerPos = scan.nextInt();
            }
            placeMove(gameBoard, playerPos, "player");
            String result = checkWinner();
            if (result.length() > 0) {
                System.out.println(result);
                break;
            }
            Random rand = new Random();
            int cpuPos = rand.nextInt(9) + 1;
            while (playerPositions.contains(cpuPos) || cpuPositions.contains(cpuPos)) {
                System.out.println("position taken !  enter correct position");
                cpuPos = rand.nextInt(9) + 1;
            }
            placeMove(gameBoard, cpuPos, "cpu");
            System.out.println("\n");
            printGameBoard(gameBoard);
            result = checkWinner();
            if (result.length() > 0) {
                System.out.println(result);
                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 placeMove(char[][] gameBoard, int pos, String user) {
        char symbol = ' ';
        if (user.equals("player")) {
            symbol = 'X';
            playerPositions.add(pos);
        } else if (user.equals("cpu")) {
            symbol = '0';
            cpuPositions.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(7, 5, 3);
        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 (playerPositions.containsAll(l)) {
                return " you won !";
            } else if (cpuPositions.containsAll(l)) {
                return " Cpu wins !";
            } else if (playerPositions.size() + cpuPositions.size() == 9) {
                return " Tie !";
            }
        }
        return "";
    }
}