如何根据 java 程序中的用户输入继续循环

Question

我有一个彩票程序，可以运行投注并随机生成号码。当用户的总奖金达到 5000 美元时，该用户将可以选择兑现 5000 美元并使用剩余余额继续循环。如果选择不兑现，用户也可以结束循环。如何根据用户输入继续循环？如果用户输入是，循环将继续，但我不知道该怎么做。有人可以帮忙吗？如果循环继续下去，由于兑现而从用户的总赢款中扣除 5000 美元，剩余余额将用于玩游戏。

我试过在主循环的多个地方放置用户输入的if语句，但用户预算一直在增加，并没有减去5000美元。

java.util.Scanner
while (budget > 0) {

                lottery = (int) (Math.random() * 100);
                guess = (int) (Math.random() * 100);

                budget -= 1;    // budget = budget-1;
                // Get digits from lottery
                int lotteryDigit1 = lottery / 10;
                int lotteryDigit2 = lottery % 10;

                // Get digits from guess
                int guessDigit1 = guess / 10;
                int guessDigit2 = guess % 10;

                System.out.println("The lottery number is " + lottery);
                System.out.println("The computer picked number is " + guess);

                // Check the guess
                if (guess == lottery) {
                    System.out.println("Exact match: you win ,000");
                    totalWin += 1000;
                } else if (guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2) {
                    System.out.println("Match all digits: you win ,000");
                    totalWin += 300;
                } else if (guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2 || guessDigit2 == lotteryDigit1
                        || guessDigit2 == lotteryDigit2) {

                    System.out.println("Match one digit: you win ,000");
                    totalWin += 100;
                } else
                    System.out.println("Sorry, no match");

                budget += totalWin;
                totalWin=0;

                if (budget > initBudget)
                    if ((budget-initBudget) >= 5000) {

                        System.out.println("You have reached the goal of 5000, we can go home!");
                        System.out.println("Enter 1 if you would like to cash out and use remaining balance to play and 0 if you would like to stop");
                        int decison = input.nextInt();
                        if (decison==1){budget=budget-5000;
                        System.out.println("Budget After play " + budget);
                        continue;
                        }break;


                    } 

                System.out.println("Budget After play " + budget);

            }

所以在我的代码中，我有循环

System.out.println("Enter 1 if you would like to cash out and use remaining balance to play and 0 if you would like to stop");
int decison = input.nextInt();
    if (decison==1){budget=budget-5000;
System.out.println("Budget After play " + budget);
continue;
}break;
}

此循环应接收用户输入，然后从总赢额中减去 5000，并使用剩余预算继续游戏。但它只会增加。如果我有 -5000，不明白为什么它会增加。

（如果可能，请帮我把答案改成 yes/no 而不是输入 1）

Answer 1

我假设您使用的是 java.util.Scanner。答案在这里；

System.out.println("Enter yes if you would like to cash out and use remaining balance to play and no if you " +
                "would like to stop");
String decison = input.nextLine();
if ("yes".equals(decison))
{
    budget = budget - 5000;
    System.out.println("Budget After play " + budget);
    continue;
}
break; // break the statement.

Answer 2

Erçin Akçay 解释了如何将输入从 int 更改为 String。

我查看了您的代码并使用它制作了一个可运行的主要方法，它按您预期的那样工作。也许初始预算需要 5k 的事实令人困惑？

if ((budget - initBudget) >= 5000)

这是我用来检查你的代码是否有帮助的全部class：

import java.util.Scanner;

public class Test {
    private static int budget;
    private static int lottery;
    private static int guess;
    private static int totalWin;
    private static int initBudget = 4500;

    public static void main(String[] args) throws InterruptedException {
        Scanner input = new Scanner(System.in);
        budget = initBudget;

        while (budget > 0) {

            lottery = (int) (Math.random() * 100);
            guess = (int) (Math.random() * 100);

            budget -= 1;    // budget = budget-1;
            // Get digits from lottery
            int lotteryDigit1 = lottery / 10;
            int lotteryDigit2 = lottery % 10;

            // Get digits from guess
            int guessDigit1 = guess / 10;
            int guessDigit2 = guess % 10;

            System.out.println("The lottery number is " + lottery);
            System.out.println("The computer picked number is " + guess);

            // Check the guess
            if (guess == lottery) {
                System.out.println("Exact match: you win ,000");
                totalWin += 1000;
            } else if (guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2) {
                System.out.println("Match all digits: you win ,000");
                totalWin += 300;
            } else if (guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2 || guessDigit2 == lotteryDigit1
                    || guessDigit2 == lotteryDigit2) {

                System.out.println("Match one digit: you win ,000");
                totalWin += 100;
            } else {
                System.out.println("Sorry, no match");
            }

            budget += totalWin;
            totalWin = 0;

            if (budget > initBudget) {
                if ((budget - initBudget) >= 5000) {

                    System.out.println("You have reached the goal of 5000, we can go home!");
                    System.out.println(
                            "Enter 1 if you would like to cash out and use remaining balance to play and 0 if you "
                                    + "would like to stop");
                    int decison = input.nextInt();
                    if (decison == 1) {
                        budget = budget - 5000;
                        System.out.println("Budget After play " + budget);
                        continue;
                    }
                    break;


                }
            }

            System.out.println("Budget After play " + budget);

        }
    }
}

Answer 3

您可以这样更改代码：

System.out.println("Enter yes if you would like to cash out and use remaining balance to play and no if you would like to stop");
String decision = input.next();
if ("Yes".equalsIgnoreCase(decision)) { // Cashing Out
    budget = budget - 5000;
    System.out.println("Budget After play " + budget);
    continue;
}
break; // breaking the loop (if user enters anything other than yes)

这里我使用了String（将用户的回复存储为一个词）。如果他输入Yes、yes或YES（忽略大小写，则认为用户要提现）循环不会中断。

如何根据 java 程序中的用户输入继续循环

How to continue loop based on user input in java program

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