Java猜拳小游戏代码

下面是一个简单的Java猜拳小游戏代码：

import java.util.Scanner;

public class RockPaperScissors {
   public static void main(String[] args) {
      System.out.println("欢迎来到猜拳游戏！");
      System.out.println("请出拳：1.石头 2.剪刀 3.布");

      Scanner scanner = new Scanner(System.in);
      int userChoice = scanner.nextInt();

      int computerChoice = (int) (Math.random() * 3) + 1;

      System.out.println("你出了" + choiceToString(userChoice));
      System.out.println("电脑出了" + choiceToString(computerChoice));

      int result = determineWinner(userChoice, computerChoice);
      if (result == 0) {
         System.out.println("平局！");
      } else if (result == 1) {
         System.out.println("你赢了！");
      } else {
         System.out.println("电脑赢了！");
      }
   }

   public static String choiceToString(int choice) {
      switch (choice) {
         case 1:
            return "石头";
         case 2:
            return "剪刀";
         case 3:
            return "布";
         default:
            return "";
      }
   }

   public static int determineWinner(int userChoice, int computerChoice) {
      if (userChoice == computerChoice) {
         return 0;
      } else if (userChoice == 1 && computerChoice == 2 || 
                 userChoice == 2 && computerChoice == 3 ||
                 userChoice == 3 && computerChoice == 1) {
         return 1;
      } else {
         return -1;
      }
   }
}

运行代码后，程序会提示用户出拳，并显示电脑出的拳和胜负结果。其中，`choiceToString`方法将数字转换为对应的拳头名称，`determineWinner`方法根据用户和电脑出的拳来判断胜负。