简单的二十一点游戏；出了差错：需要帮助

Question

这个程序的目的是创建一个随机数生成器，并选择编号为 1-11 的牌（11 是 Ace）。游戏规则不如完成的工作程序重要，我不需要花色、金钱或高分表。

我尝试创建一个卡片生成器，每次调用它时都会生成一个随机卡片值，但失败了。正如您将在代码中看到的那样，int card1 = 1 +r.nextInt();每次返回相同的值。如果它为 card1 调用 4，那么所有未来的 card1(s) 也将是 4。这不是我在创建 int 值 1-11 inc 时的想法。我曾希望 card1 每次都会返回一个随机值。

接下来我尝试将卡片总数和 newCard1 添加到当前 int 中，但失败了。这也无法按预期工作。

这是我到目前为止尝试的代码，请记住，当您向我解释您的更正时，我是一年级学生，几乎没有基础知识：

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

  class blackj
{
public static void main(String[] args)
{
    Random r = new Random();
    Scanner keyboard = new Scanner(System.in);
    String name;

    boolean playing = true;
    boolean notPlaying = true;
    int card1 = 1 + r.nextInt(11);
    int card2 = 1 + r.nextInt(11);
    int dcard1 = 1 + r.nextInt(11);
    int dcard2 = 1 + r.nextInt(11);

    int ptotal = card1+card2;
    int dtotal = dcard1+dcard2;

    int pcurrent = ptotal+card1;
    int dcurrent =dtotal+dcard1;
    {   


        System.out.println("Welcome to Blackjack ! " );
            System.out.println("Score as close to 21 without going over to win ");
                System.out.println("What is your name?");
            name = keyboard.nextLine();
                System.out.println("Hello " + name);
                System.out.println("Let's play some BlackJack!");
            System.out.println("The dealer shows: \n\t\t" +dcard1 );
            System.out.println("Your first card is: \n\t\t " +card1 );
            System.out.println("Your second card is: \n\t\t" +card2  );
            System.out.println("Giving you a grand total of: " +ptotal );

        while (playing)
            {
            System.out.println("Would you like to (H)it or (S)tick?");
                Scanner hit1 = new Scanner(System.in);
                String a = hit1.nextLine();
                if(a.equals("s"))
            {
                System.out.println("You stick at " );
                System.out.println("Now it's the dealers turn\n Dealer must draw until 17");
            }
                if(a.equals("h"))
            {
                System.out.println("Your next card is " +card2 );
                System.out.println("Giving you a new total of "+pcurrent );
                    if ((pcurrent >=22))
                System.out.println("You Busted! \nSorry! you lose");
            }
            else
            {
                System.out.println("Please press H or S");
            }

            }
      }


  }

  }

如您所见，我还没有进入经销商部分。

Answer 1

在您的 while 循环中再次调用 random：

int newCard = 1 + r.nextInt(11);

这会将变量设置为新的随机值（如果您需要重置原始卡片变量，您也可以这样做）。然后确保对照这张新的随机卡片检查用户的输入。

完成这项工作后，您可能想查看code review，了解有关构建程序的一些提示。

Answer 2

使用您当前的方法，这将帮助您开始新一轮

    Random r = new Random();
    Scanner keyboard = new Scanner(System.in);
    String name;

    boolean playing = true;

    System.out.println("Welcome to Blackjack ! ");
    System.out.println("Score as close to 21 without going over to win ");
    System.out.println("What is your name?");
    name = keyboard.nextLine();
    System.out.println("Hello " + name);
    int card1, card2 = 0, dcard1, dcard2, ptotal, dtotal, pcurrent = 0, dcurrent;
    boolean newRound = true;
    while (playing) {
        if (newRound) {
            newRound = false;
            card1 = 1 + r.nextInt(11);
            card2 = 1 + r.nextInt(11);
            dcard1 = 1 + r.nextInt(11);
            dcard2 = 1 + r.nextInt(11);

            ptotal = card1 + card2;
            dtotal = dcard1 + dcard2;

            pcurrent = ptotal + card1;
            dcurrent = dtotal + dcard1;
            System.out.println("Let's play some BlackJack!");
            System.out.println("The dealer shows: \n\t\t" + dcard1);
            System.out.println("Your first card is: \n\t\t " + card1);
            System.out.println("Your second card is: \n\t\t" + card2);
            System.out.println("Giving you a grand total of: " + ptotal);
        }

        System.out.println("Would you like to (H)it or (S)tick?");
        Scanner hit1 = new Scanner(System.in);
        String a = hit1.nextLine();
        if (a.equals("s")) {
            System.out.println("You stick at ");
            System.out.println("Now it's the dealers turn\n Dealer must draw until 17");
        }
        if (a.equals("h")) {
            System.out.println("Your next card is " + card2);
            System.out.println("Giving you a new total of " + pcurrent);
            if ((pcurrent >= 22)) {
                System.out.println("You Busted! \nSorry! you lose");
                newRound = true;
            }
        } else {
            System.out.println("Please press H or S");
        }

    }

结合其他人所说的关于 card2 和随机卡片的内容，你应该一切顺利。

Answer 3

问题是您在初始化卡片时应用了随机化。改为以这种方式声明您的卡片：

int card1 = 1 + r.nextInt(11);
int card2 = 1 + r.nextInt(11);
int dcard1 = 1 + r.nextInt(11);
int dcard2 = 1 + r.nextInt(11);

用一种方法进行随机化，如下所示：

public int getRandomInt()
{
    return 1 + r.nextInt(11);
}

然后像这样为你的卡片赋值：

card1 = getRandomInt();

现在，任何时候你给一张卡片赋值（即使是重复的同一张卡片），你都会得到一个随机值。

System.out.println("Your next card is " +card2 );

可以替换为

card2 = getRandomInt();
System.out.println("Your next card is " +card2 );