时间戳

首页 > 解决方案 > Java中的while循环不重复

java - Java中的while循环不重复

问题描述

import java.util.*;

public class Test
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        Random rand = new Random();

        System.out.print("Want to play? ('Y' or 'N'): ");
        String want = input.nextLine();

        double money;
        String word1 = "", word2 = "", word3 = "";
        int randInt1, randInt2, randInt3;

        double totalMoney = 0.0, totalEarnings = 0.0;

        do
        {
            System.out.print("How much money do you want to enter? $");
            money = input.nextDouble();
            totalMoney += money;

            randInt1 = rand.nextInt(6);

            if (randInt1 == 0)
            {
                word1 = "Cherries";
            }
            else if (randInt1 == 1)
            {
                word1 = "Oranges";
            }
            else if (randInt1 == 2)
            {
                word1 = "Plums";
            }
            else if (randInt1 == 3)
            {
                word1 = "Bells";
            }
            else if (randInt1 == 4)
            {
                word1 = "Melons";
            }
            else
            {
                word1 = "Bars";
            }

            randInt2 = rand.nextInt(6);

            if (randInt2 == 0)
            {
                word2 = "Cherries";
            }
            else if (randInt2 == 1)
            {
                word2 = "Oranges";
            }
            else if (randInt2 == 2)
            {
                word2 = "Plums";
            }
            else if (randInt2 == 3)
            {
                word2 = "Bells";
            }
            else if (randInt2 == 4)
            {
                word2 = "Melons";
            }
            else
            {
                word2 = "Bars";
            }

            randInt3 = rand.nextInt(6);

            if (randInt3 == 0)
            {
                word3 = "Cherries";
            }
            else if (randInt3 == 1)
            {
                word3 = "Oranges";
            }
            else if (randInt3 == 2)
            {
                word3 = "Plums";
            }
            else if (randInt3 == 3)
            {
                word3 = "Bells";
            }
            else if (randInt3 == 4)
            {
                word3 = "Melons";
            }
            else
            {
                word3 = "Bars";
            }

            System.out.println(word1 + "  " + word2 + "  " + word3);

            if (word1.equals(word2) && word1.equals(word3))
            {
                System.out.printf("You won $%.2f\n", (money * 3));
                totalEarnings += (money * 3);
            }
            else if ((word1.equals(word2) && !word1.equals(word3)) || (!word1.equals(word2) && word1.equals(word3)))
            {
                System.out.printf("You won $%.2f\n", (money * 2));
                totalEarnings += (money * 2);
            }
            else if ((word2.equals(word1) && !word2.equals(word3)) || (!word2.equals(word1) && word2.equals(word3)))
            {
                System.out.printf("You won $%.2f\n", (money * 2));
                totalEarnings += (money * 2);
            }
            else if ((word2.equals(word1) && !word2.equals(word3)) || (!word2.equals(word1) && word2.equals(word3)))
            {
                System.out.printf("You won $%.2f\n", (money * 2));
                totalEarnings += (money * 2);
            }
            else
            {
                System.out.println("You won $0");
            }

            System.out.print("\nWant to play again? ('Y' or 'N'): ");
            want = input.nextLine();
        }
        while (want.equalsIgnoreCase("Y"));

        System.out.printf("\n\nYou entered a total of $%.2f into the slot machine.\n", totalMoney);
        System.out.printf("Your total earnings are $%.2f", totalEarnings);
    }
}

我在尝试让这个 while 循环重复时遇到了麻烦。我包括了用户输入“Y”或“N”（“N”表示停止）的标记值。在 while 循环中，它要求用户再次输入哨兵。但是当我运行程序时，这部分没有执行。

在控制台中，显示的最后几行是：

想再玩吗？（“Y”或“N”）：

您在老虎机中输入了总计 15.00 美元。

您的总收入为 0.00 美元

所以“Y”或“N”的最后一个输入没有执行。

标签： javawhile-loop

解决方案

您没有使用您的代码使用“Enter”

    money = input.nextDouble();

然后当你得到你的代码

    want = input.nextLine();

返回一个空字符串。

将以下代码放在您的代码之后input.nextDouble()

        input.nextLine();

这将消耗您要求下注金额时的“输入”。

推荐阅读