使用亂數生成器記錄一個數字出現的次數。爪哇

在我在這里撰寫的這段代碼中，用戶輸入他們是否愿意在硬幣翻轉游戲中選擇正面或反面。我想記錄出現正面或反面的次數，并在每次更改時輸出。經過數小時的嘗試和搜索，我無法完美地理解它，所以如果有人能讓我知道我可以使用什么，請告訴我。

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

public class CoinToss {


    private enum Coin {
        Head, Tail
    }

    public static void main(String[] args) {
        CoinToss game = new CoinToss();
        game.startGame();


    }


    private void startGame() {
        Scanner scanner = new Scanner(System.in);
        Coin guess;

        while (true) {
            System.out.print("Enter your guess whether the coin will be heads or tails. Type 1 for heads, 2 for tails, or 3 to quit: ");
            String choice = scanner.nextLine();

            if (choice.equalsIgnoreCase("3")) {
                break;
            } else if (choice.equalsIgnoreCase("1")) {
                guess = Coin.Head;
            } else if (choice.equalsIgnoreCase("2")) {
                guess = Coin.Tail;
            } else {
                System.out.println("Please select either heads tails or quit.");
                continue;
            }

            Coin toss = tosscoin();

            if (guess == toss) {
                System.out.println("You guessed correctly!");
            } else {
                System.out.println("You guessed incorrectly");
            }
        }
        scanner.close();
    }


    private Coin tosscoin() {
        
        Random r = new Random();
        int sideup = r.nextInt(2);
        if (sideup == 1) {
            
            return Coin.Head;
        } else {
            return Coin.Tail;
        }


    }

}

uj5u.com熱心網友回復：

例如，您可以在 CoinToss 類中添加兩個欄位。像int head和int tails。在startGame()方法中用 0 初始化它們。然后，在tosscoin()方法中：

 if (sideup == 1) {
    heads  ;
    return Coin.Head;
} else {
    tails  ;
    return Coin.Tail;
}

您可以在startGame()方法中訪問這些欄位，并使用它們做任何您想做的事情。

您也可以直接在startGame()方法中定義這兩個變數，并根據您從tosscoin()方法獲得的 Coin 型別增加它們。

uj5u.com熱心網友回復：

下面的代碼應該可以作業。每次投擲時，它會將當前值存盤在一個變數中，并在下次將其與投擲值進行比較。

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

public class CoinToss {

    private static int headCounter;
    private static int tailCounter;
    private static int previousToss;

    private enum Coin {
        Head, Tail
    }

    public static void main(String[] args) {
        CoinToss game = new CoinToss();
        game.startGame();


    }


    private void startGame() {
        headCounter = 0;
        tailCounter = 0;
        previousToss = 0;
        Scanner scanner = new Scanner(System.in);
        Coin guess;

        while (true) {
            System.out.print("Enter your guess whether the coin will be heads or tails. Type 1 for heads, 2 for tails, or 3 to quit: ");
            String choice = scanner.nextLine();

            if (choice.equalsIgnoreCase("3")) {
                break;
            } else if (choice.equalsIgnoreCase("1")) {
                guess = Coin.Head;
            } else if (choice.equalsIgnoreCase("2")) {
                guess = Coin.Tail;
            } else {
                System.out.println("Please select either heads tails or quit.");
                continue;
            }

            Coin toss = tosscoin();

            if (guess == toss) {
                System.out.println("You guessed correctly!");
            } else {
                System.out.println("You guessed incorrectly");
            }
        }
        scanner.close();
    }


    private Coin tosscoin() {

        Random r = new Random();
        int sideup = r.nextInt(2);
        Coin currentGuess;

        if (sideup == 1) {
            headCounter  ;
            currentGuess = Coin.Head;
        } else {
            tailCounter  ;
            currentGuess = Coin.Tail;
        }
        checkIfFlipped(sideup);
        return currentGuess;

    }

    static void checkIfFlipped(int currentToss) {
        
        if (currentToss != previousToss) {
            
            if (currentToss == 0) {
                System.out.println("Coin fliped from head to tail");
            } else {
                System.out.println("Coin fliped from tail  to head");
            }
        }

        previousToss = currentToss;
    }
}

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