用Java写猜拳的程序

在Java中编写猜拳游戏是一个常见的编程练习，通常会涉及到随机数生成、用户输入验证以及简单的控制结构。下面是一个基本的猜拳游戏的简单示例，它模拟了石头（Rock）、剪刀（Scissors）、布（Paper）三种选择：

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

public class RockPaperScissors {
    public enum Move { ROCK, PAPER, SCISSORS }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        Random random = new Random();
        
        System.out.println("欢迎来到猜拳游戏！请输入你的选择：1. 石头 2. 布 3. 剪刀");
        int userChoice = input.nextInt();

        // 验证用户输入
        if (userChoice < 1 || userChoice > 3) {
            System.out.println("无效的选择，请重新输入！");
            return;
        }

        Move userMove = Move.values()[userChoice - 1];
        Move computerMove = generateComputerMove(random);

        compareMoves(userMove, computerMove);
    }

    private static Move generateComputerMove(Random random) {
        int randomIndex = random.nextInt(3);
        return Move.values()[randomIndex];
    }

    private static void compareMoves(Move userMove, Move computerMove) {
        switch (true) {
            case (userMove == computerMove):
                System.out.println("平局！电脑也选了" + computerMove);
                break;
            case (userMove == Move.ROCK && computerMove == Move.PAPER):
            case (userMove == Move.SCISSORS && computerMove == Move.ROCK):
            case (userMove == Move.PAPER && computerMove == Move.SCISSORS):
                System.out.println("恭喜你，你赢了！电脑选了" + computerMove);
                break;
            default:
                System.out.println("很遗憾，你输了！电脑选了" + computerMove);
                break;
        }
    }
}