*更新*现在我的程序可以编译但不能运行？

Question

我正在编写一个程序，提示用户在计算机上玩剪刀石头布。 我在从main方法调用int rpsls方法时遇到麻烦。 我不确定如何从main方法调用它，因为我需要将main方法中用户输入的值输入到rpsls方法中。 以下是到目前为止的内容，是的，它充满了错误，但是我主要关心的是调用该方法。

更新 -我添加了更多代码，现在程序将编译。 但是，当我尝试运行它时，它只是冻结了。 谁能帮助找到使程序运行的解决方案？

import java.util.Scanner; 
public class Rpsls
{  



   public static void main (String [] args) {
      int wins = 0;
      int ties = 0;
      int losses = 0;
      int retVal = 0;
      int output = rpsls(retVal);
      //while loop 
      Scanner input = new Scanner (System.in);
      int x = input.nextInt();
         while (x > 0 && x <= 5) {
            //input gesture 

            System.out.println(" ROCK PAPER SCISSORS LIZARD SPOCK");
            System.out.println(" (1)   (2)     (3)     (4)    (5)");
            System.out.print("Enter your choice, or 0 to end: ");

            //call rpsls for inputted gesture
            int gesture = input.nextInt();
            rpsls(gesture);
            //returned values: loss, win, or tie
            if (output == -1 ) {
               losses++;
            }
               else if (output == 0) {
                  ties++;
               }
            else {
               wins++;
            }
            //count wins and losses 
            //end while loop 
            //print sum of wins and losses. 
         }
         System.out.println("You won " + wins + " games, lost " + losses + " games, and tied " + ties + " games.");

   }

   public static int rpsls(int gesture) {
      //generate random gesture for computer 
      int attack = (int)(Math.random()*5);
      //decide who won 
           int wins = 0; int losses = 0; int ties = 0;
           int retVal = 0;     

            if (gesture == 1 && attack == 1) {
               System.out.println("You chose ROCK.");
               System.out.println("Computer chose ROCK.");
               System.out.println("It's a tie!");
               retVal = 0;
            }
            if (gesture == 1 && attack == 2) {
               System.out.println("You chose ROCK.");
               System.out.println("Computer chose PAPER.");
               System.out.println("PAPER covers ROCK.");
               System.out.println("Computer wins!");
               retVal = -1;
            }
            if (gesture == 1 && attack == 3) {
               System.out.println("You chose ROCK.");
               System.out.println("Computer chose SCISSORS.");
               System.out.println("ROCK crushes SCISSORS.");
               System.out.println("You win!");
               retVal = 1;
            }
            if (gesture == 1 && attack == 4) {
               System.out.println("You chose ROCK.");
               System.out.println("Computer chose LIZARD.");
               System.out.println("ROCK crushes LIZARD.");
               System.out.println("You win!");
               retVal = 1;
            }
            if (gesture == 1 && attack == 5) {
               System.out.println("You chose ROCK.");
               System.out.println("Computer chose SPOCK.");
               System.out.println("SPOCK vaporizes ROCK.");
               System.out.println("Computer wins!");
               retVal = -1;
            }
            if (gesture == 2 && attack == 1) {
               System.out.println("You chose PAPER.");
               System.out.println("Computer chose ROCK.");
               System.out.println("PAPER covers ROCK.");
               System.out.println("You win!");
               retVal = 1;
            }
            if (gesture == 2 && attack == 2) {
               System.out.println("You chose PAPER.");
               System.out.println("Computer chose PAPER.");
               System.out.println("It's a tie!");
               retVal = 0;
            }
            if (gesture == 2 && attack == 3) {
               System.out.println("You chose PAPER.");
               System.out.println("Computer chose SCISSORS.");
               System.out.println("SCISSORS cut PAPER.");
               System.out.println("Computer wins!");
               retVal = -1;
            }
            if (gesture == 2 && attack == 4) {
               System.out.println("You chose PAPER.");
               System.out.println("Computer chose LIZARD.");
               System.out.println("LIZARD eats PAPER.");
               System.out.println("Computer wins!");
               retVal = -1;
            }
            if (gesture == 2 && attack == 5) {
               System.out.println("You chose PAPER.");
               System.out.println("Computer chose SPOCK.");
               System.out.println("PAPER disproves SPOCK.");
               System.out.println("You win!");
               retVal = 1;
            }
            if (gesture == 3 && attack == 1) {
               System.out.println("You chose SCISSORS.");
               System.out.println("Computer chose ROCK.");
               System.out.println("ROCK crushes SCISSORS.");
               System.out.println("Computer wins!");
               retVal = -1;
            }
            if (gesture == 3 && attack == 2) {
              System.out.println("You chose SCISSORS.");
              System.out.println("Computer chose PAPER.");
              System.out.println("SCISSORS cut PAPER.");
              System.out.println("You win!");
              retVal = 1;
            }
            if (gesture == 3 && attack == 3) {
              System.out.println("You chose SCISSORS.");
              System.out.println("Computer chose SCISSORS.");
              System.out.println("It's a tie!");
              retVal = 0;
            }
            if (gesture == 3 && attack == 4) {
              System.out.println("You chose SCISSORS.");
              System.out.println("Computer chose LIZARD.");
              System.out.println("SCISSORS decapitate LIZARD.");
              System.out.println("You win!");
              retVal = 1;
            }
            if (gesture == 3 && attack == 5) {
              System.out.println("You chose SCISSORS.");
              System.out.println("Computer chose SPOCK.");
              System.out.println("SPOCK smashes SCISSORS.");
              System.out.println("Computer wins!");
              retVal = -1;
            }
            if (gesture == 4 && attack == 1) {
              System.out.println("You chose LIZARD.");
              System.out.println("Computer chose ROCK.");
              System.out.println("ROCK crushes LIZARD.");
              System.out.println("Computer wins!");
              retVal = -1;
            }
            if (gesture == 4 && attack == 2) {
              System.out.println("You chose LIZARD.");
              System.out.println("Computer chose PAPER.");
              System.out.println("LIZARD eats PAPER.");
              System.out.println("You win!");
              retVal = 1;
            }
            if (gesture == 4 && attack == 3) {
              System.out.println("You chose LIZARD.");
              System.out.println("Computer chose SCISSORS.");
              System.out.println("SCISSORS decapitate LIZARD.");
              System.out.println("Computer wins!");
              retVal = -1;
            }
            if (gesture == 4 && attack == 4) {
              System.out.println("You chose LIZARD.");
              System.out.println("Computer chose LIZARD.");
              System.out.println("It's a tie!");
              retVal = 0;
            }
            if (gesture == 4 && attack == 5) {
              System.out.println("You chose LIZARD.");
              System.out.println("Computer chose SPOCK.");
              System.out.println("LIZARD poisons SPOCK.");
              System.out.println("You win!");
              retVal = 1;
            }
            if (gesture == 5 && attack == 1) {
              System.out.println("You chose SPOCK.");
              System.out.println("Computer chose ROCK.");
              System.out.println("SPOCK vaporizes ROCK.");
              System.out.println("You win!");
              retVal = 1;
            } 
            if (gesture == 5 && attack == 2) {
              System.out.println("You chose SPOCK.");
              System.out.println("Computer chose PAPER.");
              System.out.println("PAPER disproves SPOCK.");
              System.out.println("Computer wins!");
              retVal = -1;
            }
            if (gesture == 5 && attack == 3) {
              System.out.println("You chose SPOCK.");
              System.out.println("Computer chose SCISSORS.");
              System.out.println("SPOCK smashes SCISSORS.");
              System.out.println("You win!");
              retVal = 1;
            }
            if (gesture == 5 && attack == 4) {
              System.out.println("You chose SPOCK.");
              System.out.println("Computer chose LIZARD.");
              System.out.println("LIZARD poisons SPOCK.");
              System.out.println("Computer wins!");
              retVal = -1;
            }
            if (gesture == 5 && attack == 5) {
              System.out.println("You chose SPOCK.");
              System.out.println("Computer chose SPOCK.");
              System.out.println("It's a tie!");
              retVal = 0;
            } 
            return retVal;
   }

}

Answer 1

这行：

int rpsls = gesture(x);

...创建一个int称为varaible rpsls在main函数，调用调用方法gesture ，并通过x进去。

您可能是说：

int gesture = input.nextInt();
rpsls(gesture);

...这会在您的Scanner上调用nextInt来从用户那里获取一个数字，将其记住为gesture ，然后调用您现有的rpsls方法，并传递gesture 。

Answer 2

1. 您正在调用gesture（int），并且可能正在尝试调用int rpsls（int pose） int retVal = rpsls(gesture) ;
2. 一些变量在影响其生命周期的代码块中初始化和声明，例如， input在while块内部，因此它将在外部不起作用。
3. int rpsls(int gesture)设计不当：计算机应为石头/纸张/剪刀选择一个随机值，然后将其与用户进行比较；

Answer 3

您的代码无效，您至少需要：

• 移动int x = input.nextInt(); 在while (x > 0 && x <= 5)语句之后，如果没有此语句，它将不会将您的输入用于游戏，
• 在首次使用Scanner声明之前将其移动，因为它不会编译，
• 在“手势”上更改rpsls方法中的所有“ x”，rpsls方法无法访问main方法中的“ x”变量；
• 初始化“ retVal”变量（给它一个值），例如0，以避免编译错误；
• 更改int rpsls = gesture(x); 例如int rpsls = rpsls(x); 这样，它将继续您的输入

我认为这些更改之后效果很好。

编辑：您应该删除int output = rpsls(retVal); 和retVal声明从主，因为我认为这没用，并添加int output = rpsls(x); 在x = input.nextInt(); 然后它可以正常工作。 还替换int x = input.nextInt(); 用int gesture = input.nextInt();