我如何使用“返回"一种方法在另一种方法中的价值 [英] How do I use the "return" value of one method in another method

问题描述

我目前正在从事这个玩高低骰子游戏的项目.我被困在如何使用从getHighLow返回的char和从getBet和getRoll在determineWinnings中返回的int中.这是我目前学习Java的第一年，因此将不胜感激.预先感谢您提供的任何帮助！

I am currently working on this project that plays the high low dice game. I am stuck on how to use the returned char from getHighLow and the returned int from getBet and getRoll in determineWinnings. This is my first year learning Java currently, so any help would be appreciated. Thank you in advance for any help you can give!

public static void main(String[] args) {
    Scanner keyboard = new Scanner(System.in);
    int currentPool = 100;
    getBet(keyboard, currentPool);
    getHighLow(keyboard);
    getRoll();
    >>  determineWinnings(highLow, userBet, rollSum);


}

// Given a Scanner and a current maximum amount of money, prompt the user for
// an integer representing the number of dollars that they want to bet. This
// number must be between 0 and to maximum number of dollars. If the user enters
// a number that is out of bounds, display an error message and ask again.
// Return the bet to the calling program.
private static int getBet(Scanner inScanner, int currentPool) {
    int userBet = -1;
    while (userBet == -1) {
        inScanner = new Scanner(System.in);
        System.out.println("You have $" + currentPool);
        System.out.println("Enter an amount to bet (0 to quit): ");
        userBet = inScanner.nextInt();
        if (userBet > currentPool || userBet < 0) {
            System.out.println("Your bet MUST be between 0 and " + currentPool + " dollars");
            userBet = -1;
        }
        if (userBet == 0) {
            System.out.println("You have " + currentPool + " dollars left.");
            System.out.println("Goodbye!");
        }
    }
    return userBet;
}

// Given a Scanner, prompt the user for a single character indicating whether
// they
// would like to bet High ('H'), Low ('L') or Sevens ('S'). Your code should
// accept
// either capital or lowercase answers, but should display an error if the user
// attempts
// to enter anything but one of these 3 values and prompt for a valid answer.
// Return the character to the calling program.
private static char getHighLow(Scanner inScanner) {
    Scanner keyboard = new Scanner(System.in);
    int i = 0;
    String userChoice = "";
    while (i == 0) {
        System.out.println("High, low or sevens (H/L/S): ");
        userChoice = keyboard.nextLine();
        if (userChoice.length() > 1 || (userChoice.charAt(0) != 'H' && userChoice.charAt(0) != 'h'
                && userChoice.charAt(0) != 'L' && userChoice.charAt(0) != 'l' && userChoice.charAt(0) != 'S'
                && userChoice.charAt(0) != 's')) {
            System.out.println("ERROR: You must type H, L, or S.");
        } else {
            i++;
        }
    }
    char highLow = 'N';
    if (userChoice.charAt(0) == 'H' || userChoice.charAt(0) == 'h') {
        highLow = 'H';
    } else if (userChoice.charAt(0) == 'L' || userChoice.charAt(0) == 'l') {
        highLow = 'L';
    } else {
        highLow = 'S';
    }
    return highLow;
}

// Produce a random roll of a single six-sided die and return that value to the
// calling
// program
private static int getRoll() {
    int dieOne = (int) (Math.random() * 6 + 1);
    System.out.println("Die 1 rolls: " + dieOne);
    int dieTwo = (int) (Math.random() * 6 + 1);
    System.out.println("Die 2 rolls: " + dieTwo);
    int rollSum = dieOne + dieTwo;
    System.out.println("The total of two dice is: " + rollSum);
    return rollSum;
}

// Given the choice of high, low or sevens, the player's bet and the total
// result of
// the roll of the dice, determine how much the player has won. If the player
// loses
// the bet then winnings should be negative. If the player wins, the winnings
// should
// be equal to the bet if the choice is High or Low and 4 times the bet if the
// choice
// was Sevens. Return the winnings to the calling program.
private static int determineWinnings(char highLow, int bet, int roll) {
    int highLowValue = 0;
    int winnings = 0;
    if (highLow == 'H') {
        highLowValue = 8;
    } else if (highLow == 'L') {
        highLowValue = 6;
    } else {
        highLowValue = 7;
    }
    if (roll >= 8 && highLowValue == 8) {
        winnings = bet;
        System.out.println("You won " + winnings + " dollars!");
    } else if (roll <= 6 && highLowValue == 6) {
        winnings = bet;
        System.out.println("You won " + winnings + " dollars!");
    } else if (roll == 7 && highLowValue == 7) {
        winnings = bet * 4;
        System.out.println("You won " + winnings + " dollars!");
    } else {
        winnings = -1 * bet;
    }
    return winnings;

}

推荐答案

您可以将每个方法的输出分配给变量，也可以直接在defineWinnings上调用方法.

You can assign the output of each method to variable or call methods directly on determineWinnings.

计划1)

int userBet = getBet(keyboard, currentPool);
char highLow = getHighLow(keyboard);
int roll = getRoll();
determineWinnings(highLow, userBet, roll);

计划2)

determineWinnings(getHighLow(keyboard), getBet(keyboard, currentPool), getRoll());

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