java - Java 中的 "Stick Game"程序无法正常运行？

Question

我最近决定要编写一个程序来玩名为“Nim”的游戏，在该游戏中，您从预定数量的“木棍”开始，每个玩家轮流移除 1 到 3 个木棍坚持。谁拿走最后一根棍子谁就输了。

无论如何，我已经编写了我的程序，它几乎可以完美地编译和运行。只有一个小问题。游戏结束后，它会显示两次“good game”画面，游戏的第一行出现在中间(我会在最后张贴截图)。这很奇怪，我只是想知道你们是否可以看一看。

我正在截取程序的一部分(只有一个类，名为 Cup())，因为它有点长，所以如果您看到一个您不认识的类，请忽略它。类在程序中的作用很容易解释，而不是错误发生的地方。这是代码。

class SticksGame
{
    public static void main(String[] args) throws InputMismatchException
    {
    Random r = new Random();
    int score1 = 0, score2 = 0;
    Cup c = new Cup();
    int j = 0, d = 0, i = 0, k = 0;
    boolean b = true;
    String exit = "default";
    Scanner input = new Scanner(System.in);
    System.out.println("Welcome to the Sticks Game! Last Stick loses! Must pick 1 - 3 sticks.");
    System.out.println();
    do
    {
        i = r.nextInt(15) + 9;
        System.out.println("We begin with " + i + " sticks");
        System.out.println();
        while (b == true)
        {
            System.out.println("Your move");
            k = input.nextInt();
            if (k > 3)
            {
                System.out.println("You must select between 1 and 3 sticks");
                k = input.nextInt();
            }
            else if (k < 1) 
            {
                System.out.println("You must select between 1 and 3 sticks");
                k = input.nextInt();
            }
            else
            {
                j = i;
                i = i - k;  
                if (i <= 0)
                {
                    System.out.println("Computer wins!");
                    score2 = (score2 + 1);
                    b = false;
                }
                else
                {
                    System.out.println("We now have " + i + " sticks.");            
                }
                d = c.select();
                System.out.println("Computer removes " + d + " sticks");
                i = i - d;
                System.out.println("We now have " + i + " sticks");
                if (i <= 0)
                {
                    System.out.println("You Win!");
                    score1 = (score1 + 1);
                    b = false;
                }
            }
        }
        System.out.println();
        System.out.println("Good game!");
        System.out.println("Your score: " + score1 + "     Computer's Score: " + score2);
        System.out.println("Press enter if you'd like to play again. Otherwise, type \"quit\"");
        exit = input.nextLine();
        b = true;
    }   
    while(!"quit".equals(exit));
}

感谢任何帮助!谢谢:)

~安德鲁

为 JANOS 编辑的代码

有点晚了，我知道，但这是为任何想玩的人准备的完整游戏!随时将其复制并粘贴到您的记事本中，然后使用 cmd 执行(您必须将我的名字作为评论放在最上面!):)

//Andrew Mancinelli: 2015
import java.util.*;
import java.io.*;
class Cup
{
    private ArrayList<Integer> c = new ArrayList<Integer>();
    public Cup()
    {
        c.add(1);
        c.add(2);
        c.add(3);
    }
    public int count()
    {
        return c.size();
    }
    public int select()
    {
        int index = (int)(c.size() * Math.random());
        return c.get(index);
    }
    public void remove(Integer move)
        {
        c.remove(move);
    }
}
class SticksGame
{
    public static void help()
    {
        System.out.println();
        System.out.println("Okay, so here's how it works... The object of the game is to NOT have the last stick. Whoever ends up with the very last stick loses.");
        System.out.println();
        System.out.println("Rule 1: You will each take turns removing sticks. you may only remove 1, 2, or 3 sticks in a turn");
        System.out.println();
        System.out.println("Rule 2: The beginning number of sticks is always random between 9 and 24 sticks");
        System.out.println();
        System.out.println("Rule 3: Whoever chooses the last stick, LOSES!");
        System.out.println();
        System.out.println("And that's it! Simple, right?");
}
    public static void main(String[] args) throws InputMismatchException
    {
        Random r = new Random();
        int score1 = 0, score2 = 0;
        Cup c = new Cup();
        int j = 0, d = 0, i = 0, k = 0;
        boolean b = true;
        String exit = "default", inst = "default";
        Scanner input = new Scanner(System.in);
        System.out.println("Welcome to the Sticks Game! Last Stick loses!");
        System.out.println();
        System.out.println("Need some instructions? Type \"help\" now to see the instructions. Otherwise, press enter to play!");
        inst = input.nextLine();
        if (inst.equals("help"))
        {
            help();
            System.out.println();
            System.out.println("press \"enter\" to begin!");
            inst = input.nextLine();
        }
        do
        {
            i = r.nextInt(15) + 9;
            System.out.println();
            System.out.println("We begin with " + i + " sticks");
            System.out.println();
            while (b == true)
            {
                System.out.println("Your move");
                k = input.nextInt();
                if (k > 3)
                {
                    System.out.println("You must select between 1 and 3 sticks");
                    k = input.nextInt();
                }
                else if (k < 1) 
                {
                    System.out.println("You must select between 1 and 3 sticks");
                    k = input.nextInt();
                }
                else
                {
                    j = i;
                    i = i - k;  
                    if (i <= 0)
                    {
                        System.out.println("Computer wins!");
                        score2 = (score2 + 1);
                        b = false;
                        break;
                    }
                    else
                    {
                        System.out.println("We now have " + i + " sticks.");            
                    }
                    d = c.select();
                    i = i - d;
                    if (i >= 0)
                    {
                        System.out.println("Computer removes " + d + " sticks");
                        System.out.println("We now have " + i + " sticks");
                    }
                    if (i <= 0)
                    {
                        System.out.println("You Win!");
                        score1 = (score1 + 1);
                        b = false;
                        break;
                    }
                }
            }
            System.out.println();
            System.out.println("Good game!");
            System.out.println("Your score: " + score1 + "     Computer's Score: " + score2);
            System.out.println("Press enter if you'd like to play again. Otherwise, type \"quit\"");
            input.nextLine();
            exit = input.nextLine();
            b = true;
        }   
        while(!"quit".equals(exit));
    }
}

Answer 1

问题是这个条件总是为真:

while (exit != "quit");

因为 != 表示“不相同”，exit 变量和 "quit" 不相同。使用 equals 方法检查逻辑相等性。

在此示例中，将循环条件改为:

while (!"quit".equals(exit));

关于你没有正确开始第二场比赛的其他问题，您需要重新初始化状态变量，例如重置 b = true。

最后，请注意 input.nextInt() 不会读取您在输入数字时按下的换行符。因此，当 exit = input.nextLine() 运行时，它会读取换行符，实际上不会让您有机会键入“退出”。要解决此问题，请在 exit = input.nextLine();

之前添加 input.nextLine();