JAVA实现石头剪刀布

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

public class test20 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请出拳:");
        String s = scanner.nextLine();
        if (s.equals("石头")){
            System.out.println("您使出了石头");
        }
        if (s.equals("剪刀")){
            System.out.println("您使出了剪刀");
        }
        if (s.equals("布")){
            System.out.println("您使出了布");
        }
        Random random = new Random();
        int i = random.nextInt(3);
        System.out.println(i);
        switch (i){
            case 0:
                String s1 = "石头";
                System.out.println("对方使出了"+s1);
                if (s.equals("石头")&&s1.equals("石头")){
                    System.out.println("对局平局");
                }
                if (s.equals("剪刀")&&s1.equals("石头")){
                    System.out.println("您输了");
                }
                if (s.equals("布")&&s1.equals("石头")){
                    System.out.println("您赢了");
                }
                break;
            case 1:
                String s2 = "剪刀";
                System.out.println("对方使出了"+s2);
                if (s.equals("石头")&&s2.equals("剪刀")){
                    System.out.println("您赢了");
                }
                if (s.equals("剪刀")&&s2.equals("剪刀")){
                    System.out.println("对局平局");
                }
                if (s.equals("布")&&s2.equals("剪刀")){
                    System.out.println("您输了");
                }
                break;
            case 2:
                String s3 = "布";
                System.out.println("对方使出了"+s3);
                if (s.equals("石头")&&s3.equals("布")){
                    System.out.println("您输了");
                }
                if (s.equals("剪刀")&&s3.equals("布")){
                    System.out.println("您赢了");
                }
                if (s.equals("布")&&s3.equals("布")){
                    System.out.println("对局平局");
                }
                break;
        }

    }
}