猪游戏：为什么代码无法运行或编译，我做错了什么？

Question

简介

再一次练习循环。这个程序会比上一个程序更复杂一些。

对于这个程序，您将创建一个骰子游戏 Pig 的模拟。

游戏的目标是让玩家在对手之前获得100分，更多细节将在任务中讨论。

在这种情况下，对手将是计算机。

任务 1

这个游戏需要两个 6 面骰子。您需要使用随机数生成器来模拟这些骰子。

两个骰子（随机数生成器）必须：

产生 1-6 之间的值 有一个140L和340L的种子，分别用于一模和二模（用于测试目的） 任务 2

现在你已经有了你的骰子，我们可以回顾一下你将要玩的规则。

规则：

每回合，玩家将轮流掷两个骰子。 如果两个骰子上都没有出现 1，则将这些值添加到玩家的总数中。然后他们可以选择再次滚动（选择 0）或将回合传给其他玩家（选择 1）。 如果其中一个骰子出现 1，则玩家在整个回合中不会获得任何积分，并且轮到另一位玩家滚动（之前回合获得的积分仍将存在于他们的总数中）。 如果玩家掷出两个 1，则玩家的回合结束，他们的总数重置为 0。 您将需要一个随机数生成器来确定是计算机（0）还是玩家（1）先走。这也将用于模拟计算机选择再次滚动或通过翻身。这台发电机的种子是 140L。

假设来自用户的有效输入。

输出应以“欢迎猪游戏”语句开头

以下所有用户提示应类似于：

轮到你了（当前点数：0） 你掷出 3 和 2，本回合获得的点数：5 按 0 再次滚动或按 1 开始轮到计算机 所有计算机提示应如下所示：

轮到计算机了（当前点数：0） 电脑掷出 1 和 4，没有得分，轮到你了 他们宣布轮到哪位玩家和当前分数。

然后是由哪个玩家随后滚动的数字

如果获得积分，则显示该回合获得的总积分（参见用户提示的第 2 行） 如果掷出一个，宣布没有得分并轮到下一位玩家（见电脑提示第 2 行） 如果两者都是一个，则使用显示消息“/whichever player/rolled two one, point reset and /opponent's/ turn”

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

public class GameOfPigs {
    public static void main(String[] args) {
        Random die1 = new Random(140L);
        Random die2 = new Random(340L);
        Random compDecision = new Random(140L);
        Scanner scnr = new Scanner(System.in);

        int computerTotal = 0;
        int playerTotal = 0;
        boolean playerTurn = true;

        // Decides who goes first...
        if ((compDecision.nextInt(2)) == 0) {
            playersTurn = false;
        }

        System.out.println("Welcome of the Game of Pigs");

        // Main game loop
        while (computerTotal < 100 && playerTotal < 100) {
            System.out.println();
            int currentPlayerPoints = 0;

            // Player's loop
            while (playersTurn) {
                System.out.println("Your turn (current points: " + playerTotal + ")");
                int roll1 = die1.nextInt(6) + 1;
                int roll2 = die2.nextInt(6) + 1;

                // First Rule...Not the same as the example in class!!!
                // Adjust accordingly!!!! Multiple ways to do this!!!!
                if (roll1 == 1 && roll2 == 1) {
                    playerTotal = 0;
                    playersTurn = false;
                    break;
                }

                // Second Rule
                else if (roll1 == 1 || roll2 == 1) {
                    playerTotal = playerTotal;
                    playersTurn = false;
                    break;
                }

                // Third Rule
                else {
                    playerTotal += currentPlayerPoints;
                    int choice = scnr.nextInt();
                    if (choice == 1) {
                        playerTotal += currentPlayerPoints;
                        playersTurn = false;
                        break;
                    }
                }
            }
            if (playerTotal >= 100) {
               break;
            }

            // 
            int currentCompPoints = 0;

            // Computer's loop
            while (!playersTurn) {
                System.out.println("Computer's turn (current points: " + computerTotal + ")");
                int roll1 = die1.nextInt(6)+1;
                int roll2 = die2.nextInt(6)+1;

                if (roll1 == 1 && roll2 == 1) {
                    computerTotal = 0;
                }
                else if (roll1 == 1 || roll2 == 1) {
                    computerTotal = computerTotal;
                }
                else {
                    int choice = compDecision.nextInt(2);
                    computerTotal += currentPlayerPoints;
                    }
                }
            }           
        }
        if (playerTotal > computerTotal) {
            System.out.println("Congratulations! You won!");
        }
        else {
            System.out.println("Too Bad, the computer won.");
        }
    }
}

GameOfPigs.java:86: error: illegal start of type
        if (playerTotal > computerTotal) {
        ^
GameOfPigs.java:86: error: <identifier> expected
        if (playerTotal > computerTotal) {
                       ^
GameOfPigs.java:86: error: ';' expected
        if (playerTotal > computerTotal) {
                         ^
GameOfPigs.java:86: error: illegal start of type
        if (playerTotal > computerTotal) {
                                       ^
GameOfPigs.java:86: error: <identifier> expected
        if (playerTotal > computerTotal) {
                                        ^
GameOfPigs.java:86: error: ';' expected
        if (playerTotal > computerTotal) {
                                          ^
GameOfPigs.java:87: error: illegal start of type
            System.out.println("Congratulations! You won!");
                  ^
GameOfPigs.java:87: error: ';' expected
            System.out.println("Congratulations! You won!");
                      ^
GameOfPigs.java:87: error: invalid method declaration; return type required
            System.out.println("Congratulations! You won!");
                       ^
GameOfPigs.java:87: error: illegal start of type
            System.out.println("Congratulations! You won!");
                               ^
GameOfPigs.java:89: error: class, interface, or enum expected
        else {
        ^
GameOfPigs.java:91: error: class, interface, or enum expected
        }
        ^
12 errors

---

谢谢！但现在它说：

GameOfPigs.java:18: error: cannot find symbol
            playersTurn = false;
            ^
  symbol:   variable playersTurn
  location: class GameOfPigs
GameOfPigs.java:29: error: cannot find symbol
            while (playersTurn) {
                   ^
  symbol:   variable playersTurn
  location: class GameOfPigs
GameOfPigs.java:29: error: illegal start of type
            while (playersTurn) {
                  ^
GameOfPigs.java:38: error: cannot find symbol
                    playersTurn = false;
                    ^
  symbol:   variable playersTurn
  location: class GameOfPigs
GameOfPigs.java:45: error: cannot find symbol
                    playersTurn = false;
                    ^
  symbol:   variable playersTurn
  location: class GameOfPigs
GameOfPigs.java:55: error: cannot find symbol
                        playersTurn = false;
                        ^
  symbol:   variable playersTurn
  location: class GameOfPigs
GameOfPigs.java:68: error: cannot find symbol
            while (!playersTurn) {
                    ^
  symbol:   variable playersTurn
  location: class GameOfPigs
7 errors

Answer 1

if (playerTotal > computerTotal) 行之前的大括号过多。去掉一个，结构应该没问题。问题是，如果大括号过多，您会在最后一个 if 语句之前关闭方法，因此该语句基本上位于方法之外，这在 Java 中是不允许的。如果您使用 IDE，它应该会显示给您。

Answer 2

*请注意，此答案只会删除您代码中先前指定的错误，不一定作为您问题的最终解决方案。

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

public class GameOfPigs {



    public static void main(String[] args) {
        Random die1 = new Random(140L);
        Random die2 = new Random(340L);
        Random compDecision = new Random(140L);

        Scanner scnr = new Scanner(System.in);

        int computerTotal = 0;
        int playerTotal = 0;
        boolean playersTurn = false;

        // Decides who goes first...
        if ((compDecision.nextInt(2)) == 0) {
            playersTurn = false;
        }

        System.out.println("Welcome of the Game of Pigs");

        // Main game loop
        while (computerTotal < 100 && playerTotal < 100) {
            System.out.println();
            int currentPlayerPoints = 0;

            // Player's loop
            while (playersTurn) {

                int roll1 = die1.nextInt(6) + 1;
                int roll2 = die2.nextInt(6) + 1;
                System.out.println("Your turn (current points: " + playerTotal + ")");
                // First Rule...Not the same as the example in class!!!
                // Adjust accordingly!!!! Multiple ways to do this!!!!
                if (roll1 == 1 && roll2 == 1) {
                    playerTotal = 0;
                    playersTurn = false;
                    break;
                }

                // Second Rule
                else if (roll1 == 1 || roll2 == 1) {
                    playerTotal = playerTotal;
                    playersTurn = false;
                    break;
                }

                // Third Rule
                else {
                    playerTotal += currentPlayerPoints;
                    int choice = scnr.nextInt();
                    if (choice == 1) {
                        playerTotal += currentPlayerPoints;
                        playersTurn = false;
                        break;
                    }
                }
            }
            if (playerTotal >= 100) {
               break;
            }            // 
            int currentCompPoints = 0;

            // Computer's loop
            while (!playersTurn) {
                System.out.println("Computer's turn (current points: " + computerTotal + ")");
                int roll1 = die1.nextInt(6)+1;
                int roll2 = die2.nextInt(6)+1;

                if (roll1 == 1 && roll2 == 1) {
                    computerTotal = 0;
                }
                else if (roll1 == 1 || roll2 == 1) {
                    computerTotal = computerTotal;
                }
                else {
                    int choice = compDecision.nextInt(2);
                    computerTotal += currentPlayerPoints;
                    }
                }


        if (playerTotal > computerTotal) {
            System.out.println("Congratulations! You won!");
        }
        else {
            System.out.println("Too Bad, the computer won.");
        }
    }
}
}