人机猜拳java代码

下面是一个简单的人机猜拳游戏的 Java 代码示例：

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

public class RockPaperScissors {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();
        String[] choices = {"rock", "paper", "scissors"};

        int computerChoiceIndex = random.nextInt(choices.length);
        String computerChoice = choices[computerChoiceIndex];

        System.out.println("Please enter your choice (rock, paper, or scissors):");
        String userChoice = scanner.nextLine().toLowerCase();

        if (!userChoice.equals("rock") && !userChoice.equals("paper") && !userChoice.equals("scissors")) {
            System.out.println("Invalid choice!");
        } else if (userChoice.equals(computerChoice)) {
            System.out.println("Tie!");
        } else if ((userChoice.equals("rock") && computerChoice.equals("scissors")) ||
                   (userChoice.equals("paper") && computerChoice.equals("rock")) ||
                   (userChoice.equals("scissors") && computerChoice.equals("paper"))) {
            System.out.println("You win!");
        } else {
            System.out.println("Computer wins!");
        }

        System.out.println("Computer chose " + computerChoice + ".");
    }
}

该代码首先使用 `java.util.Random` 类生成计算机的选择，然后使用 `java.util.Scanner` 类接收用户输入的选择。接下来，代码根据用户和计算机的选择来判断胜负，并输出结果。最后，代码显示计算机的选择。