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Question

當我的程序打印獲勝者時，如果 O 是獲勝者，它會打印“獲勝者是 X”，如果 X 是獲勝者，則打印“獲勝者是 O”。 請幫助我了解我做錯了什么。 我正在使用 turn() 方法打印獲勝者。 然而，它正在打印下一個 turn() 字母，而不是當前的 turn() 字母，這將是獲勝者。 至少這是我對它的理解。

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

public class TicTacToe1 {

public static void main(String[] args) {
    welcome();
    initializeBoard();
    printBoard();

    while ((!checkWin()) && (!checkDraw())) {
        playerMove();
        printBoard();
        System.out.println();
        if ((!checkWin()) && (!checkDraw())) {
            computerMove();
            printBoard();
        }
        System.out.println();
        if (checkWin() == true) {
            System.out.println("The winner is " + turn());
        } else if (checkWin() && checkDraw() == true) {
            System.out.println("The winner is " + turn());
        } else if (checkDraw() == true) {
            System.out.println("Draw");
        }
    }

}

private static String[][] board = new String[3][3];

private static int row, column;

public static Scanner scan = new Scanner(System.in);

public static String currentTurn = "X";

// public static String computerTurn = "O";

public static String turn() {
    if (currentTurn == "X") {
        currentTurn = "O";
    } else {
        currentTurn = "X";
    }
    return currentTurn;
}

private static void welcome() {
    System.out.println("Tic Tac Toe");
    System.out.println("The user will play first.");
    System.out.println("Please enter your coordinates for your location row (1-3) column (1-3):");
}

public static void initializeBoard() { // initialize tic tac toe
    for (int i = 0; i < board.length; i++) {
        for (int j = 0; j < board.length; j++) {
            board[i][j] = "-";
        }
    }
}

public static void printBoard() {

    for (int i = 0; i < board.length; i++) {
        System.out.println();
        for (int j = 0; j < board.length; j++) {
            if (j == 0) {
                System.out.print("| ");
            }
            System.out.print(board[i][j] + " | ");
        }
    }
}

public static void playerMove() {
    System.out.println();
    System.out.println("Your Move: ");
    row = scan.nextInt() - 1;
    column = scan.nextInt() - 1;
    if (board[row][column] == "-") {
        board[row][column] = turn();
    } else if (board[row][column] != "-") {
        System.out.println("Invalid entry. Please go again");
        row = scan.nextInt() - 1;
        column = scan.nextInt() - 1;
        board[row][column] = turn();
    }

}

public static void computerMove() {
    Random computerMove = new Random();
    row = computerMove.nextInt(3);
    column = computerMove.nextInt(3);
    while (board[row][column] != "-") {
        row = computerMove.nextInt(3);
        column = computerMove.nextInt(3);
    }
    board[row][column] = turn();
}

public static boolean checkWin() {
    return (checkDiagonalWin() || checkHorizontalWin() || checkVerticalWin());

}

public static boolean checkDiagonalWin() {
    if ((board[0][0] == board[1][1]) && (board[0][0] == board[2][2]) && (board[1][1] != "-")) {
        return true;
    }
    if ((board[0][2] == board[1][1]) && (board[0][2] == board[2][0]) && (board[1][1] != "-")) {
        return true;
    }
    return false;
}

public static boolean checkHorizontalWin() {

    if ((board[0][0] == board[0][1]) && (board[0][0] == board[0][2]) && (board[0][0] != "-")) {
        return true;
    } else if ((board[1][0] == board[1][1]) && (board[1][0] == board[1][2]) && (board[1][0] != "-")) {
        return true;
    } else if ((board[2][0] == board[2][1]) && (board[2][0] == board[2][2]) && (board[2][0] != "-")) {
        return true;
    }
    // }
    return false;
}

public static boolean checkVerticalWin() {

    if ((board[0][0] == board[1][0]) && (board[0][0] == board[2][0]) && (board[0][0] != "-")) {
        return true;
    } else if ((board[0][1] == board[1][1]) && (board[0][1] == board[2][1]) && (board[0][1] != "-")) {
        return true;
    } else if ((board[0][2] == board[1][2]) && (board[0][2] == board[2][2]) && (board[0][2] != "-")) {
        return true;
    }
    // }
    return false;
}

public static boolean checkDraw() {

    for (int i = 0; i < board.length; i++) {
        for (int j = 0; j < board.length; j++) {
            if (board[i][j] == "-") {
                return false;
            }
        }
    }
    return true;
}
}

Answer 1

改變

System.out.println("The winner is " + turn());

到

System.out.println("The winner is " + currentTurn);

每次調用turn()都會修改當前的回合。