Question

我正在创建一个摇滚，纸张，剪刀游戏来试用我的Java技能。在我的代码中，我有一个循环循环，直到胜利者赢或输了他们的数量。这部分不起作用。它直接进入逻辑语句，即使它没有完成该循环，它仍然在while循环之外。

代码：

package rps_game;
// Rock, Paper, Scissors game
//

import java.util.*;

public class rock_paper_scissors {
    public static void main(String args[]) {

        Scanner input = new Scanner(System.in);
        Scanner lineInput = new Scanner(System.in);
        Random rand = new Random();

        String choices[] = { "rock", "paper", "scissors" };

        int winRounds = 0;
        boolean running = true;

        int rounds = 0;
        int wins = 0;
        int loses = 0;

        String yourChoice = "";
        String compChoice = "";
        while (running = true) { // main loop

            try {
                System.out
                        .println("Enter the amount of rounds you want to play: ");
                rounds = input.nextInt(); // gets input
                winRounds = (rounds / 2) + 1;
                System.out.println("You are playing best of " + winRounds
                        + " out of " + rounds);

                //running = false; // breaks off from loop

                while (wins < winRounds && loses < winRounds) { // this while loop
                    System.out.println("Enter either Rock, Paper or Scissors: ");

                    yourChoice = lineInput.nextLine();
                    yourChoice= yourChoice.toLowerCase();
                    if (Arrays.asList(choices).contains(yourChoice)) { // what use entered
                        break;
                    } else {
                        System.out.println("You did not enter either Rock, Paper or Scissors.");
                        System.exit(0);
                    }

                    compChoice = choices[rand.nextInt(choices.length)];
                    System.out.println("ROCK.. PAPER.. SCISSORS!");
                    System.out.println("You entered: " + yourChoice + " and the computer entered: " + compChoice);

                    if (yourChoice.equals(compChoice)){
                        System.out.println("\nIt's a draw!");
                    }else if(yourChoice.equals("rock") && compChoice.equals("paper")){
                        System.out.println("\nYou lose!");
                        loses++;
                    }else if(yourChoice.equals("paper") && compChoice.equals("rock")){
                        System.out.println("\nYou win!");
                        wins++;
                    }else if(yourChoice.equals("scissors") && compChoice.equals("paper")){
                        System.out.println("\nYou win!");
                        wins++;
                    }else if(yourChoice.equals("paper") && compChoice.equals("Scissors")){
                        System.out.println("\nYou lose!");
                        loses++;
                    }else if(yourChoice.equals("rock") && compChoice.equals("scissors")){
                        System.out.println("\nYou win!");
                        wins++;
                    }else if(yourChoice.equals("scissors") && compChoice.equals("rock")){
                        System.out.println("\nYou lose!");
                        loses++;
                    }else{
                        break;
                    }

                }
                System.out.println("\nGAME FINISHED!");

                if (wins > loses){
                    System.out.println("\nYOU WIN THE GAME!!");
                }else if(wins < loses){
                    System.out.println("\nYOU LOST THE GAME!! :( ");
                }else{
                    System.out.println("It's a draw!!");
                    System.exit(0);
                }

            } catch (Exception e) { // if error pops up
                System.out.println("You DID NOT enter a WHOLE NUMBER.");
                break;
            }

        }

        input.close();
        lineInput.close();
    }
}

为什么它不像它应该的那样循环？我真的无法解决这个问题

Answer 1

问题是你的休息陈述

if (Arrays.asList(choices).contains(yourChoice)) { // what use entered
    break;
}

break会导致您退出循环，并且当您选择正确的输入时，我不认为您想要退出循环。

事实上，因为你在System.exit块中也有else命令，所以在这两行之后你的内部while循环都不会执行，无论如何。

if (Arrays.asList(choices).contains(yourChoice)) { // what use entered
    break;
} else {
    System.out.println("You did not enter either Rock, Paper or Scissors.");
    System.exit(0);
}

我建议删除break语句，并将System.exit(0);更改为continue，这将跳转到循环的下一次迭代。如果这样做，您也可以重新使用if-logic，因为只有1个条件。

Answer 2

就像@David Ehrmann所说，你需要将running = true更改为running == true或仅while(running)，这个if语句中的逻辑是错误的：

if (Arrays.asList(choices).contains(yourChoice)) { // what use entered
   break;
} else {
   System.out.println("You did not enter either Rock, Paper or Scissors.");
   System.exit(0);
}

输入正确的输入后，您不希望break。适当的if语句应该是：

if (!(Arrays.asList(choices).contains(yourChoice))) 
{
     System.out.println("You did not enter either Rock, Paper, or Scissors.");
     running = false;  
     break;
}
else
{
   // the rest of the playing code
}

这假定您要优雅地退出。它应该打印“这是一个平局。”并以这种方式清理任何资源......如果这就是你想要的。

Java程序不会循环while循环 - 直接转到if语句

2 个答案: