使用随机数生成器记录一个数字出现的次数。爪哇

Question

在我在这里编写的这段代码中，用户输入他们是否想在掷硬币游戏中选择正面或反面。我想记录出现正面或反面的次数，并在每次变化时输出。经过数小时的尝试和搜索，我无法完美地理解它，所以如果有人能让我知道我可以利用什么，请告诉我。

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;
        }


    }

}

Answer 1

下面的代码应该可以工作。每次投掷时，它会将当前值存储在一个变量中，并在下次与投掷值进行比较。

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;
    }
}

Answer 2

例如，您可以在 CoinToss 类中添加两个字段。像 int head 和 int tails。在 startGame() 方法中将它们初始化为 0。然后，在 tosscoin() 方法中：

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

您可以在 startGame() 方法中访问这些字段，并对它们做任何您想做的事情。

您也可以直接在 startGame() 方法中定义这两个变量，并根据您从 tosscoin() 方法获得的 Coin 类型递增它们.