石头剪刀布 java

package pratice;

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



public class GameSSS {
    public static void main(String[] args) {
        //初始化，定义双方手势变量字符串
        Scanner scanner = new Scanner(System.in);
        System.out.println("欢迎来到剪刀石头布游戏!n请输入剪刀、石头或布:");
        //我方手势
        String pose = scanner.nextLine();
        if (!pose.equals("石头") && !pose.equals("布") && !pose.equals("剪刀")) {
            System.out.println("输入无效，游戏结束");
            return;
        }
        //对方手势
        String rivalPose;
        //结果
        int flag = 0;

        //模拟随机出拳
        Random random = new Random();
        double ran = random.nextDouble();

        if (ran > 2.0 / 3) rivalPose = "剪刀";
        else if (ran <= 2.0 / 3 && ran > 1.0 / 3) rivalPose = "石头";
        else rivalPose = "布";

        //计算结果
        switch (pose) {
            case "剪刀": {
                if (rivalPose.equals("剪刀"))  flag = 0;
                else if (rivalPose.equals("石头")) flag = -1;
                else flag = 1;
                break;
            }
            case "石头": {
                if (rivalPose.equals("石头"))  flag = 0;
                else if (rivalPose.equals("布")) flag = -1;
                else flag = 1;
                break;
            }
            case "布" :
                if (rivalPose.equals("布"))  flag = 0;
                else if (rivalPose.equals("剪刀")) flag = -1;
                else flag = 1;
                break;

        }
        if (flag == 0) System.out.println("对手出的是" + rivalPose + ", 平局。");
        else if (flag == 1) System.out.println("对手出的是" + rivalPose + ", 你赢了。");
        else System.out.println("对手出的是" + rivalPose + ", 你输了。");
    }
}