猪的游戏：为什么代码不能工作或编译，我做错了什么？

Question

介绍

再练习一次循环。这个程序会比前一个更多一些。

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。你将需要用随机数生成器模拟这些骰子。

每转一圈，玩家将轮流掷两个骰子。如果任何一个骰子上都没有出现1，则这些值将加到玩家的总数中。然后他们可以选择再次滚动（选择0)，或者将回合传递给另一个玩家（选择1）。如果在其中一个骰子上出现1，则该玩家在整个回合中的总积分不会增加，而是成为另一个玩家的滚动回合（在前一回合中获得的积分仍然存在于他们的总积分中）。如果一个球员滚动两个1s，该球员的回合结束，他们的总数被重置为0。您将需要一个更多的随机数生成器，以确定是计算机（0）还是玩家（1）将先走。这也将用于模拟计算机的选择，要么再次滚动或通过翻转。这台发电机的种子将是140L。

假设用户输入有效。

输出应以“欢迎猪的游戏”开始

计算机的回合（当前点数：0）计算机滚动1和4，没有获得点数和你的回合，他们宣布哪个玩家的回合和当前点数。

然后是哪个玩家滚动的数字

如果赢得了积分，则显示该回合的总积分（请参见用户提示的第2行），如果一个回合被滚动，则宣布没有赢得积分和下一个玩家的回合（请参见计算机提示的第2行），如果两者都是1，则使用显示消息“/无论哪个玩家/滚动了两个，积分重置和/对手的/回合”

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

谢了！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

在if(playerTotal>computerTotal)行前多了一个大括号。拆下一个，结构应该没问题。问题是，由于大括号太多，您在最后一个if语句之前关闭了方法，因此该语句基本上在方法之外，这在Java中是不允许的。如果您使用IDE，它应该向您显示这一点。